306 MORE Vocabulary Words You Must Know for the SAT & ACT

Building a strong vocabulary takes time, and there are always more useful words to learn. Our original 306 Vocabulary Words You Must Know for the SAT & ACT introduced students to essential vocabulary for understanding challenging passages, interpreting precise language, and navigating standardized tests with greater confidence.

This new collection, 306 MORE Vocabulary Words You Must Know for the SAT & ACT, builds on that foundation with 306 additional words. Together, the two lists provide students with 612 high-value vocabulary words to strengthen their reading, writing, and test-taking skills.

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Reading Comprehension

The SAT and ACT require students to understand increasingly sophisticated texts across literature, history, social science, and science. A broader vocabulary helps you comprehend unfamiliar passages more efficiently, recognize subtle distinctions in meaning, and better understand an author's ideas, tone, and argument.

Words in Context

Knowing a word's definition is only part of vocabulary mastery. On the SAT and ACT, you must often determine which word most precisely fits the meaning and logic of a passage. Expanding your vocabulary helps you distinguish among words with similar but different meanings.

Writing and Language

Strong vocabulary also supports your ability to evaluate word choice and communicate ideas precisely. Understanding how words function in context can help you recognize clearer, more accurate, and more effective ways to express an idea.

Confidence

Every word you learn makes unfamiliar vocabulary less intimidating. By studying these 306 additional words alongside the original 306, you will be better prepared to encounter challenging language without allowing a single unfamiliar word to disrupt your understanding of an entire passage.

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Here are 306 more words you must know for the SAT and ACT:

Word	Part of Speech	Definition	Root / Stem	Synonym	Antonym	Sample Sentence
Abate	Verb	To become less intense or to reduce in force	abat- (lessen)	Diminish	Intensify	The winds began to abate after midnight, allowing crews to resume repairs.
Abolish	Verb	To formally put an end to a system, practice, or institution	abol- (destroy/end)	Eliminate	Establish	The reformers sought to abolish a rule that no longer served its original purpose.
Abound	Verb	To exist in large numbers or quantities	abund- (plenty)	Teem	Lack	Examples of the pattern abound in the later chapters of the study.
Abridge	Verb	To shorten a text without losing its essential meaning	bridg-/brev- (shorten)	Condense	Expand	The editor abridged the memoir for publication while preserving its central argument.
Abstruse	Adj.	Difficult to understand because of complexity or obscurity	abstrus- (hidden)	Obscure	Clear	The article's abstruse terminology made the basic finding harder to recognize.
Acclaim	Noun/Verb	Enthusiastic public praise; to praise publicly	claim-/clam- (call out)	Praise	Condemn	The novel received critical acclaim for its inventive structure.
Accommodate	Verb	To make room for, adapt to, or meet the needs of	commod- (fit/convenient)	Adapt	Exclude	The revised model can accommodate several competing explanations.
Accrete	Verb	To grow gradually by the addition of layers or material	cret-/cresc- (grow)	Accumulate	Erode	Mineral deposits accrete slowly around the vent over many years.
Acquiesce	Verb	To accept something reluctantly but without protest	quiesc- (rest/quiet)	Consent	Resist	The committee acquiesced to the compromise after hours of debate.
Adroit	Adj.	Skillful and clever, especially in handling a situation	droit- (right/skillful)	Deft	Clumsy	Her adroit handling of the interview prevented the discussion from becoming hostile.
Aesthetic	Adj./Noun	Concerned with beauty or artistic taste; a particular artistic style	aesthet- (perception)	Artistic	Unattractive	The architect favored an aesthetic that emphasized simplicity and natural light.
Affinity	Noun	A natural attraction, similarity, or connection	affin- (related)	Liking	Aversion	The researcher noted an affinity between the two authors' approaches to narrative.
Affront	Noun/Verb	An action or remark that causes offense; to insult openly	front- (face/confront)	Insult	Compliment	The decision was viewed as an affront to the community's long-standing traditions.
Aggrandize	Verb	To increase the power, status, or importance of someone or something	grand- (great)	Elevate	Diminish	Critics argued that the biography tried to aggrandize its subject beyond the evidence.
Aggregation	Noun	A collection or gathering of separate things into a whole	greg- (group/flock)	Collection	Dispersion	The final dataset was an aggregation of records from twelve independent studies.
Align	Verb	To bring into agreement, coordination, or proper position	line- (line)	Coordinate	Diverge	The new evidence aligns with the earlier interpretation of the inscription.
Alleviate	Verb	To make pain, difficulty, or a problem less severe	lev- (lighten)	Relieve	Aggravate	The policy was designed to alleviate the financial burden on small organizations.
Allocate	Verb	To distribute resources or duties for a particular purpose	loc- (place)	Assign	Withhold	The agency allocated additional funds to regions facing the greatest need.
Amass	Verb	To gather or accumulate a large amount	mass- (heap)	Accumulate	Disperse	Over decades, the archive amassed thousands of letters and photographs.
Ameliorate	Verb	To make a bad or unsatisfactory situation better	melior- (better)	Improve	Worsen	The intervention helped ameliorate the effects of prolonged drought.
Amenable	Adj.	Open and responsive to suggestion; capable of being affected or treated	amen- (pleasant/compliant)	Receptive	Resistant	The director was amenable to revising the plan after reviewing the new data.
Amorphous	Adj.	Lacking a clearly defined shape, structure, or organization	morph- (form)	Formless	Structured	The movement remained amorphous until its leaders adopted a formal platform.
Analogous	Adj.	Similar in a way that permits a useful comparison	analog- (proportion/relation)	Comparable	Dissimilar	The author argues that the two historical episodes are analogous in several important respects.
Anathema	Noun	Something or someone intensely disliked or rejected	anathem- (curse)	Abhorrence	Favorite	For the minimalist designer, unnecessary ornament was anathema.
Annihilate	Verb	To destroy completely	nihil- (nothing)	Destroy	Preserve	The collision was powerful enough to annihilate the fragile structure.
Anomalous	Adj.	Deviating from what is normal, standard, or expected	nomal- (regular)	Abnormal	Typical	Researchers repeated the measurement because the first result was anomalous.
Anomaly	Noun	Something that deviates from what is normal or expected	nomal- (regular)	Irregularity	Norm	The unusually high reading appeared to be an anomaly rather than a lasting trend.
Antecedence	Noun	The condition of coming before something else in time or order	ante- + ced- (before + go)	Priority	Succession	The scholar emphasized the antecedence of the earlier manuscript.
Anthropogenic	Adj.	Caused or produced by human activity	anthrop- + gen- (human + produce)	Human-caused	Natural	The study separates anthropogenic warming from changes caused by natural cycles.
Apathy	Noun	Lack of interest, enthusiasm, or concern	path- (feeling)	Indifference	Enthusiasm	Public apathy made it difficult for organizers to sustain the campaign.
Appraise	Verb	To assess the value, quality, or significance of something	pris-/preti- (value)	Evaluate	Ignore	Experts appraised the artifact before the museum agreed to purchase it.
Apprise	Verb	To inform or notify someone	pris- (inform)	Inform	Conceal	The chair apprised the board of the new evidence before the vote.
Arcane	Adj.	Understood by few; mysterious or specialized	arcan- (secret)	Esoteric	Familiar	The manual relied on arcane terminology known mainly to specialists.
Archetypal	Adj.	Representing a very typical or ideal example of a type	arche- + typ- (original + model)	Quintessential	Atypical	The character is an archetypal trickster who disrupts social conventions.
Ascribe	Verb	To attribute something to a particular cause, source, or person	scrib- (write/assign)	Attribute	Dissociate	The researchers ascribed the decline to a combination of environmental factors.
Assuage	Verb	To make an unpleasant feeling or condition less intense	suav-/saug- (soothe)	Soothe	Intensify	The additional evidence did little to assuage concerns about the study's reliability.
Assuming	Adj.	Presumptuous or overly confident; also taking something as given	sum- (take)	Presumptuous	Modest	His assuming tone suggested that he expected agreement without offering evidence.
Attenuate	Verb	To reduce the force, effect, or intensity of something	tenu- (thin)	Weaken	Amplify	Dense vegetation can attenuate noise from a nearby roadway.
Attest	Verb	To provide evidence or testimony that something is true	test- (witness)	Confirm	Deny	Several independent records attest to the settlement's early importance.
Attrition	Noun	Gradual reduction or weakening through sustained pressure or loss	trit- (rub/wear)	Erosion	Growth	The organization lost volunteers through steady attrition over several years.
Authentic	Adj.	Genuine; real and not copied or fabricated	authent- (genuine)	Genuine	Fake	Experts concluded that the signature was authentic after comparing it with verified samples.
Authoritative	Adj.	Reliable and commanding respect because of expertise or accuracy	author- (source/originator)	Definitive	Unreliable	The review is considered an authoritative account of the field's early development.
Banal	Adj.	So common or overused as to be unoriginal or boring	ban- (commonplace)	Trite	Original	The critic dismissed the film's message as banal despite its impressive visuals.
Begrudge	Verb	To resent someone for having or receiving something	grudge- (resentment)	Resent	Welcome	Few scholars would begrudge the researcher recognition for years of careful work.
Belie	Verb	To give a false impression of or contradict	lie- (false appearance)	Contradict	Confirm	The calm surface of the lake belied the strong current beneath it.
Benign	Adj.	Gentle, harmless, or not threatening	ben- (good)	Harmless	Harmful	What first appeared to be a serious defect proved to be benign.
Bestow	Verb	To give something as an honor, gift, or benefit	stow- (place/give)	Grant	Withhold	The academy bestowed its highest award on the pioneering scientist.
Breadth	Noun	Wide range, scope, or extent	broad- (wide)	Scope	Narrowness	The breadth of the survey allowed the researchers to compare many regions.
Burgeoning	Adj.	Growing or developing rapidly	bourgeon- (bud/grow)	Expanding	Declining	A burgeoning body of evidence challenged the older theory.
Calibrate	Verb	To adjust or check an instrument so that it measures accurately	calibr- (measure)	Adjust	Misalign	Technicians calibrated the sensors before beginning the experiment.
Capacious	Adj.	Having a great deal of space or capacity	cap- (hold)	Roomy	Cramped	The capacious archive can house millions of documents.
Capricious	Adj.	Changing suddenly and unpredictably	capric- (whim)	Fickle	Consistent	The river's capricious course made permanent settlement difficult.
Casual	Adj.	Done without much thought, formality, or concern; occasional	cas- (chance)	Informal	Deliberate	A casual reading might miss the qualification in the final sentence.
Catalyze	Verb	To cause or accelerate a change or process	catalys- (trigger)	Spur	Inhibit	The discovery helped catalyze a new wave of research.
Circumspection	Noun	Careful consideration of possible risks or consequences	circum- + spect- (around + look)	Caution	Recklessness	The board approached the proposal with circumspection because the long-term costs were uncertain.
Cite	Verb	To mention as evidence, authority, or an example	cit- (summon/mention)	Reference	Omit	The author cites three recent studies in support of the claim.
Clandestine	Adj.	Kept secret, especially because it is unauthorized	clandestin- (secret)	Covert	Open	The group held clandestine meetings to avoid detection.
Coalesce	Verb	To come together and form one whole	coal-/alesc- (grow together)	Merge	Separate	Several small organizations coalesced into a single national coalition.
Colloquialism	Noun	An informal word or expression used in ordinary conversation	loqu- (speak)	Informalism	Formalism	The translator preserved the character's colloquialisms to maintain a conversational tone.
Commend	Verb	To praise formally or strongly	commend- (entrust/praise)	Praise	Criticize	Reviewers commended the study for its transparent methodology.
Complacent	Adj.	Too satisfied with oneself or a situation to recognize danger or need for change	plac- (please)	Self-satisfied	Vigilant	Early success made the company complacent about emerging competitors.
Complicate	Verb	To make something more difficult, complex, or confusing	plic- (fold)	Confound	Simplify	A second variable complicates the interpretation of the results.
Conflate	Verb	To combine things that should remain distinct	flat-/flar- (blend)	Merge	Distinguish	The argument conflates correlation with causation.
Confounded	Adj.	Confused or perplexed; also disproved or defeated in expectation	fund- (confuse)	Bewildered	Clear	Researchers were confounded by the unexpected pattern in the data.
Conjecture	Noun/Verb	A conclusion or guess based on incomplete evidence; to make such a guess	ject- (throw)	Speculation	Certainty	Without additional records, any claim about the author's intent remains conjecture.
Consensus	Noun	General agreement among members of a group	sens- (feel/agree)	Agreement	Dissent	The panel reached a consensus after reviewing the evidence.
Consonant	Adj.	In agreement or harmony with	son- (sound together)	Consistent	Incompatible	The new interpretation is consonant with the surviving archival evidence.
Conspicuous	Adj.	Easily noticed or attracting attention	spic-/spec- (look)	Noticeable	Inconspicuous	A conspicuous gap in the timeline raised questions about the account.
Contentious	Adj.	Likely to cause disagreement or argument	tend-/tent- (strive)	Controversial	Harmonious	The committee postponed a vote on the most contentious proposal.
Continuity	Noun	Uninterrupted connection, sequence, or consistency	continu- (unbroken)	Consistency	Disruption	The repeated imagery creates continuity across the novel's separate sections.
Contrivance	Noun	Something deliberately devised, especially in an artificial or clever way	triv-/contriv- (devise)	Device	Spontaneity	The sudden coincidence felt like a narrative contrivance rather than a natural development.
Contrived	Adj.	Artificially created rather than natural or spontaneous	contriv- (devise)	Artificial	Natural	The dialogue sounded contrived because no one would normally speak that way.
Convene	Verb	To come together or call people together for a meeting	ven- (come)	Assemble	Disperse	The committee will convene next week to review the proposal.
Convergence	Noun	The process of coming together or becoming more similar	verg- (turn)	Merging	Divergence	The study documents a gradual convergence in the two regions' economic patterns.
Corollary	Noun	A proposition or result that follows naturally from another	coroll- (following result)	Consequence	Premise	A corollary of the theory is that demand should decline as the price rises.
Corroborate	Verb	To confirm or strengthen a claim with additional evidence	robor- (strength)	Confirm	Contradict	Independent records corroborate the witness's account.
Counterfactual	Adj./Noun	Relating to what did not happen but could be imagined as an alternative	counter- + fact- (against fact)	Hypothetical	Factual	The historian considers a counterfactual scenario in which the treaty was never signed.
Counterintuitive	Adj.	Contrary to what one would naturally expect	counter- + intuit- (against instinct)	Unexpected	Obvious	The price increase had the counterintuitive effect of increasing demand.
Credible	Adj.	Believable and worthy of trust	cred- (believe)	Plausible	Implausible	The claim became more credible after independent researchers reproduced the result.
Cryptic	Adj.	Mysterious, obscure, or difficult to interpret	crypt- (hidden)	Enigmatic	Explicit	The note was so cryptic that scholars disagreed about its meaning.
Culled	Verb	Selected or gathered from a larger group	cull- (select)	Selected	Included indiscriminately	The examples were culled from hundreds of archived letters.
Cursory	Adj.	Done quickly and without close attention	curs- (run)	Superficial	Thorough	A cursory inspection failed to reveal the flaw.
Dearth	Noun	A scarcity or lack of something	dearth- (scarcity)	Shortage	Abundance	A dearth of reliable records makes the period difficult to study.
Decisive	Adj.	Settling an issue or producing a clear result	cis- (cut/decide)	Conclusive	Indecisive	The final experiment provided decisive evidence against the older model.
Decouple	Verb	To separate things that were previously connected	couple- (pair)	Separate	Link	The policy attempts to decouple economic growth from increased emissions.
Decry	Verb	To publicly condemn or criticize strongly	cry- (call out)	Denounce	Praise	Critics decried the proposal as unnecessarily restrictive.
Defer	Verb	To postpone or to yield respectfully to another's judgment	fer- (carry)	Postpone	Advance	The board chose to defer the decision until more evidence was available.
Denote	Verb	To indicate, signify, or stand for	not- (mark)	Signify	Obscure	In the chart, darker shading denotes higher population density.
Desultory	Adj.	Lacking a clear plan, purpose, or sustained effort	salt-/sult- (leap)	Aimless	Systematic	The discussion became desultory once the group lost sight of its central question.
Deterrent	Noun/Adj.	Something that discourages an action; serving to discourage	terr- (frighten)	Discouragement	Incentive	The high cost may act as a deterrent to participation.
Detractor	Noun	A person who criticizes or disparages someone or something	tract- (draw away)	Critic	Supporter	Even the policy's strongest detractors acknowledged that it addressed a real problem.
Detrimental	Adj.	Causing harm or damage	detriment- (loss/harm)	Harmful	Beneficial	Excessive heat can be detrimental to seed development.
Diffusion	Noun	The spreading of something from an area of greater concentration to a wider area	fus- (pour)	Spread	Concentration	The paper traces the diffusion of the technology across neighboring regions.
Diminution	Noun	A reduction in size, importance, or intensity	min- (small)	Decrease	Increase	The reform produced a gradual diminution in administrative costs.
Diminutive	Adj.	Very small; also a form indicating smallness	min- (small)	Tiny	Large	The diminutive device was designed to fit inside a narrow cavity.
Discerning	Adj.	Showing good judgment and an ability to notice subtle differences	cern- (separate/distinguish)	Perceptive	Undiscriminating	A discerning reader will notice the shift in tone near the end of the passage.
Discrepancy	Noun	A difference or inconsistency between things that should agree	crep- (differ)	Inconsistency	Agreement	The auditors investigated a discrepancy between the two sets of figures.
Discretion	Noun	Careful judgment; freedom to decide how to act	cret- (separate/decide)	Judgment	Indiscretion	The statute gives judges some discretion in determining the penalty.
Disingenuous	Adj.	Not candid or sincere; pretending to know less than one does	gener-/gen- (honest/noble, by usage)	Insincere	Candid	The claim that no one foresaw the problem struck reviewers as disingenuous.
Dispassionate	Adj.	Not influenced by strong emotion; impartial	passion- (emotion)	Impartial	Emotional	The panel sought a dispassionate assessment of the competing proposals.
Dispersed	Adj./Verb	Spread over a wide area; scattered	spers- (scatter)	Scattered	Concentrated	The population is dispersed across dozens of small settlements.
Disquieting	Adj.	Causing worry, unease, or anxiety	quiet- (calm)	Unsettling	Reassuring	The sudden decline in nesting sites was a disquieting sign.
Dissonance	Noun	Lack of harmony or agreement; a clash between ideas, sounds, or beliefs	son- (sound)	Discord	Harmony	The essay explores the dissonance between the policy's stated goals and its actual effects.
Distort	Verb	To twist out of the true meaning, shape, or proportion	tort- (twist)	Misrepresent	Clarify	A selective quotation can distort an author's original argument.
Dogmatic	Adj.	Asserting beliefs as unquestionably true and resisting alternatives	dogmat- (doctrine)	Rigid	Open-minded	The critic rejected the theory's dogmatic insistence on a single explanation.
Durability	Noun	The ability to withstand wear, pressure, or damage over time	dur- (last)	Endurance	Fragility	Engineers tested the material's durability under repeated stress.
Dwindling	Adj.	Gradually becoming smaller or fewer	dwindl- (shrink)	Declining	Growing	The species survives in a dwindling number of habitats.
Eclipse	Verb/Noun	To overshadow or surpass; an obscuring of one body by another	eclips- (leave out/obscure)	Overshadow	Highlight	The later discovery eclipsed the earlier finding in public attention.
Efface	Verb	To erase, remove, or make less noticeable	fac- (face)	Erase	Preserve	Weathering had effaced much of the inscription from the stone.
Efficacy	Noun	The ability to produce the intended result	fac- (do/make)	Effectiveness	Ineffectiveness	The trial was designed to measure the treatment's efficacy.
Elicit	Verb	To draw out or bring forth a response or information	lic-/licit- (draw out)	Evoke	Suppress	The interview questions were designed to elicit detailed responses.
Elide	Verb	To omit, suppress, or pass over something	lid-/laed- (strike out)	Omit	Include	The summary elides several qualifications that are central to the original argument.
Emanate	Verb	To come or flow out from a source	man- (flow)	Radiate	Converge	A faint odor appeared to emanate from the damaged container.
Embellished	Adj./Verb	Decorated with extra details; made more elaborate, sometimes by exaggeration	bell- (beautify)	Ornamented	Plain	The later account was embellished with dramatic details absent from earlier records.
Emblematic	Adj.	Serving as a symbol or typical example of something	emblem- (symbol)	Symbolic	Unrepresentative	The building became emblematic of the city's industrial transformation.
Emergence	Noun	The process of coming into existence or becoming visible	merg- (rise from)	Appearance	Disappearance	The study traces the emergence of a new literary form.
Emissary	Noun	A person sent on a special mission, especially as a representative	miss- (send)	Envoy	Recipient	The ruler sent an emissary to negotiate a temporary peace.
Emulate	Verb	To imitate with the aim of matching or surpassing	emul- (rival)	Imitate	Differ	Younger architects sought to emulate the simplicity of the earlier design.
Encompass	Verb	To include or surround a wide range of things	camp-/compass- (circle)	Include	Exclude	The review encompasses research from biology, economics, and psychology.
Endearing	Adj.	Inspiring affection or warm regard	dear- (beloved)	Charming	Off-putting	Her willingness to admit mistakes made the narrator surprisingly endearing.
Engender	Verb	To cause or give rise to a feeling, condition, or situation	gen- (produce)	Generate	Prevent	The policy change may engender greater trust in the institution.
Entanglement	Noun	A complicated involvement or condition of being intertwined	tang- (touch)	Complication	Separation	The novel portrays the political entanglement of several powerful families.
Entice	Verb	To attract or tempt by offering something appealing	entic- (lure)	Lure	Repel	The lower fees were intended to entice more applicants.
Enumerate	Verb	To list or count items one by one	numer- (number)	List	Generalize	The report enumerates five factors that contributed to the decline.
Epitomize	Verb	To represent the perfect or most typical example of something	epitom- (summary/example)	Exemplify	Contradict	The compact design came to epitomize the company's emphasis on efficiency.
Equivocal	Adj.	Open to more than one interpretation; deliberately ambiguous	equi- + voc- (equal + voice)	Ambiguous	Unequivocal	The witness gave an equivocal response that neither confirmed nor denied the allegation.
Eschew	Verb	To deliberately avoid or refrain from	eschiv- (avoid)	Avoid	Embrace	The author eschews technical jargon in favor of direct language.
Esoteric	Adj.	Intended for or understood by a small group with specialized knowledge	esoter- (inner)	Arcane	Accessible	The article explains an esoteric debate in terms a general reader can follow.
Evince	Verb	To show or reveal clearly	vinc-/vin- (show/conquer, by usage)	Display	Conceal	The letters evince a growing concern about the project's cost.
Exacerbate	Verb	To make a problem or negative condition worse	acerb- (harsh)	Aggravate	Alleviate	Drought conditions could exacerbate the region's water shortage.
Excise	Verb	To cut out or remove	cis- (cut)	Remove	Insert	The editor excised several repetitive paragraphs from the final draft.
Exhaustive	Adj.	Thorough and complete, considering all relevant elements	haust- (draw out)	Comprehensive	Partial	The team conducted an exhaustive review of the surviving records.
Exorbitant	Adj.	Unreasonably or excessively high	orbit- (track/bound)	Excessive	Reasonable	The exorbitant cost prevented many small schools from adopting the technology.
Expansive	Adj.	Covering a wide area or range; broad in scope	pand- (spread)	Broad	Narrow	The book offers an expansive account of the movement's international influence.
Expedite	Verb	To make a process happen more quickly or efficiently	ped- (foot)	Accelerate	Delay	The agency simplified the application to expedite emergency funding.
Exploit	Verb	To make full use of a resource or opportunity, sometimes unfairly	ploit-/plic- (unfold/use)	Utilize	Neglect	The researchers exploited a rare archive to test the hypothesis.
Expound	Verb	To explain or present an idea in detail	pon-/pound- (put forth)	Explain	Obscure	The lecturer expounded on the theory before presenting the evidence.
Extemporaneous	Adj.	Spoken or done with little or no advance preparation	tempor- (time)	Impromptu	Rehearsed	Her extemporaneous remarks were clearer than the prepared statement.
Extensibility	Noun	The capacity to be extended, expanded, or adapted	tens- (stretch)	Expandability	Rigidity	The software's extensibility allows new tools to be added without redesigning the core system.
Extol	Verb	To praise highly and enthusiastically	tol-/toll- (raise)	Praise	Denounce	Reviewers extolled the novel's precise and economical prose.
Extraneous	Adj.	Irrelevant or unrelated to the matter being considered; unnecessary	extra- (outside)	Irrelevant	Pertinent	The editor removed extraneous details that distracted from the main claim.
Extrapolate	Verb	To infer or estimate beyond known data using an observed pattern	pol-/lat- (extend beyond)	Project	Observe directly	Researchers cautioned against extrapolating the results to populations not included in the study.
Feasible	Adj.	Possible and practical to accomplish	fac- (do/make)	Practicable	Impossible	The engineers concluded that the proposed redesign was technically feasible.
Fecund	Adj.	Fertile or highly productive, especially in producing ideas or offspring	fecund- (fruitful)	Prolific	Barren	The period was unusually fecund, producing several influential artistic movements.
Foment	Verb	To stir up or encourage the development of conflict, unrest, or a condition	foment- (warm)	Incite	Quell	The inflammatory pamphlets helped foment public unrest.
Foreground	Verb/Noun	To emphasize or make prominent; the part of a scene nearest the viewer	fore- + ground	Highlight	Background	The essay foregrounds economic causes rather than political personalities.
Foresight	Noun	The ability to anticipate what may happen and plan accordingly	fore- + sight	Prudence	Shortsightedness	The city's investment showed considerable foresight as demand later increased.
Forestall	Verb	To prevent or delay something by acting in advance	fore- + stall	Preempt	Permit	Officials introduced temporary measures to forestall a larger crisis.
Forsake	Verb	To abandon or give up something valued or previously followed	forsak- (abandon)	Abandon	Retain	The movement refused to forsake its core principles for short-term popularity.
Foster	Verb	To encourage or promote the development of something	foster- (nurture)	Encourage	Stifle	The program was designed to foster collaboration among researchers.
Fraudulent	Adj.	Intended to deceive, especially for unlawful gain	fraud- (deceit)	Deceptive	Legitimate	Auditors identified several fraudulent transactions in the account.
Grudgingly	Adverb	In a reluctant or resentful manner	grudge- (resent)	Reluctantly	Willingly	Even the critic grudgingly acknowledged the strength of the new evidence.
Habituate	Verb	To make accustomed to something through repeated exposure	habit- (custom)	Accustom	Sensitize	Repeated exposure can habituate animals to the presence of researchers.
Hallmark	Noun	A distinctive feature or characteristic	hallmark- (quality mark)	Signature	Anomaly	Careful documentation is a hallmark of rigorous research.
Halt	Verb/Noun	To stop; a stop or interruption	halt- (stop)	Cease	Continue	The discovery forced the excavation to halt while experts assessed the site.
Halting	Adj.	Slow, hesitant, or interrupted in movement or speech	halt- (stop)	Hesitant	Fluent	The witness gave a halting account of the event.
Hamper	Verb	To hinder or obstruct progress	hamper- (restrain)	Impede	Facilitate	Limited access to records hampered the investigation.
Harbinger	Noun	A sign or person that indicates the approach of something	harbinger- (forerunner)	Forerunner	Aftermath	The early decline in rainfall may be a harbinger of more severe drought.
Heterogeneous	Adj.	Made up of parts that differ in kind or character	hetero- + gen- (different + kind)	Diverse	Homogeneous	The sample was heterogeneous, containing participants from many backgrounds.
Hypothesize	Verb	To propose a tentative explanation that can be tested	hypo- + thes- (under + place)	Theorize	Verify	The researchers hypothesized that temperature affected migration timing.
Iconoclasm	Noun	The rejection or challenging of established beliefs, traditions, or institutions	icon- + clas- (image + break)	Nonconformity	Orthodoxy	The artist's iconoclasm unsettled critics who favored traditional forms.
Idiosyncratic	Adj.	Peculiar or distinctive to an individual or thing	idio- (one's own)	Distinctive	Conventional	The composer developed an idiosyncratic style that was difficult to imitate.
Idle	Adj./Verb	Inactive or not in use; to spend time without productive activity	idl- (inactive)	Inactive	Busy	The machinery remained idle during the inspection.
Illusory	Adj.	Based on an illusion; appearing real but not actually so	illus- (deceive/play upon)	Deceptive	Real	The apparent agreement between the studies proved illusory after closer analysis.
Imbue	Verb	To fill or inspire with a quality, feeling, or idea	imbu- (soak)	Infuse	Drain	The narrator imbues the ordinary setting with a sense of mystery.
Immoderate	Adj.	Excessive or beyond reasonable limits	moder- (measure)	Excessive	Moderate	The critic objected to the article's immoderate claims.
Imperative	Adj./Noun	Absolutely necessary or vitally important; an urgent command	imper- (command)	Essential	Optional	It is imperative that the samples remain uncontaminated.
Imperious	Adj.	Arrogantly commanding or domineering	imper- (command)	Domineering	Humble	The official's imperious manner discouraged open discussion.
Imposing	Adj.	Impressive because of size, dignity, or appearance	pos- (place)	Impressive	Unimpressive	The museum's imposing entrance was designed to convey civic importance.
Impugn	Verb	To challenge as false or call into question someone's honesty or motives	pugn- (fight)	Challenge	Defend	The attorney attempted to impugn the witness's credibility.
Inane	Adj.	Lacking sense, meaning, or substance; silly	inan- (empty)	Senseless	Meaningful	The reviewer dismissed the slogan as inane.
Inaugurate	Verb	To formally begin or introduce something	augur- (consecrate/begin)	Initiate	Terminate	The university inaugurated a new research center in the spring.
Incentive	Noun	Something that motivates or encourages a person to act	cent-/cend- (set in motion)	Motivation	Deterrent	The grant provides an incentive for institutions to share their data.
Incongruous	Adj.	Out of place or not in harmony with its surroundings	congru- (agree/fit)	Incompatible	Congruous	The modern logo looked incongruous on the restored nineteenth-century facade.
Incredulity	Noun	The state of being unwilling or unable to believe something	cred- (believe)	Disbelief	Belief	The audience reacted with incredulity to the unsupported claim.
Incremental	Adj.	Occurring through a series of small additions or changes	cresc-/crement- (grow)	Gradual	Sudden	The policy produced incremental improvements rather than an immediate transformation.
Indecipherable	Adj.	Impossible or extremely difficult to read or understand	cipher- (code)	Illegible	Readable	Water damage left several pages of the manuscript indecipherable.
Index	Noun/Verb	An indicator or measure; a list or system for locating information	dic-/index- (point out)	Indicator	Concealment	The researchers used pollen diversity as an index of ecosystem health.
Indigenous	Adj.	Originating or occurring naturally in a particular place; native	gen- (birth/origin)	Native	Introduced	The project documents plants indigenous to the island.
Indoctrinate	Verb	To teach someone to accept beliefs uncritically	doctrin- (teaching)	Condition	Educate critically	The author warns that education should inform rather than indoctrinate.
Indolence	Noun	Habitual laziness or avoidance of activity	dol-/indol- (inactive)	Laziness	Diligence	The essay criticizes the ruler's indolence during the crisis.
Induce	Verb	To cause, bring about, or persuade someone to do something	duc- (lead)	Cause	Prevent	The treatment may induce a temporary change in blood pressure.
Inertia	Noun	Resistance to change in motion or, figuratively, to change in behavior	iner- (inactive)	Stasis	Momentum	Institutional inertia slowed adoption of the new policy.
Inestimable	Adj.	Too great to be calculated or fully appreciated	estim- (value)	Incalculable	Negligible	The archive is of inestimable value to historians.
Inherent	Adj.	Existing as a natural or essential part of something	her- (stick)	Intrinsic	External	Some uncertainty is inherent in any long-term forecast.
Inimical	Adj.	Hostile to or harmful to something	inimic- (enemy)	Hostile	Favorable	The prolonged heat was inimical to the species' survival.
Insurmountable	Adj.	Too great or difficult to be overcome	mount- (rise)	Overwhelming	Surmountable	The obstacles were serious but not insurmountable.
Intercede	Verb	To intervene on behalf of another person or cause	ced- (go between)	Intervene	Withdraw	A mediator interceded before the dispute escalated.
Intermingle	Verb	To mix or blend together	inter- + mingle	Mix	Separate	Historical fact and legend intermingle throughout the narrative.
Intransigent	Adj.	Unwilling to change one's views or agree to compromise	transig- (come to agreement)	Unyielding	Flexible	Negotiations stalled because both sides remained intransigent.
Inure	Verb	To accustom someone to something unpleasant so that it becomes easier to endure	ur-/inur- (harden by use)	Accustom	Sensitize	Years of fieldwork had inured the team to harsh weather.
Invariable	Adj.	Not changing; consistent and fixed	vari- (change)	Constant	Variable	The ritual followed an invariable sequence each year.
Invoke	Verb	To cite, appeal to, or call upon something as authority or support	voc- (call)	Appeal to	Disregard	The attorney invoked a prior ruling to support the argument.
Irrefutable	Adj.	Impossible to deny or disprove	refut- (disprove)	Conclusive	Disputable	The newly discovered records provided irrefutable evidence of the transaction.
Irrespective	Adj./Adverb	Without regard to; regardless of	respect- (look back/consider)	Regardless	Dependent on	All applicants are evaluated by the same criteria irrespective of school size.
Itemize	Verb	To list individual items separately	item- (particular)	Enumerate	Summarize	The invoice itemizes each service and its cost.
Lambaste	Verb	To criticize very harshly	lambast- (beat/criticize)	Denounce	Praise	Reviewers lambasted the report for ignoring contradictory evidence.
Latitude	Noun	Freedom or scope to act, think, or vary; also angular distance north or south	lat- (broad)	Leeway	Restriction	The guidelines give instructors considerable latitude in choosing examples.
Magnify	Verb	To make something appear larger or more important; to increase	magn- (great)	Enlarge	Reduce	The lens magnifies details that are invisible to the unaided eye.
Malign	Verb/Adj.	To speak harmful falsehoods about; harmful or evil in character	mal- (bad)	Slander	Praise	The article unfairly maligned researchers whose conclusions it misunderstood.
Manifest	Adj./Verb	Clear or obvious; to show or display plainly	manu- + fest- (hand + make evident)	Evident	Hidden	The effects of the policy became manifest within a few months.
Maudlin	Adj.	Overly sentimental or tearfully emotional	Magdalene (sentimental association)	Sentimental	Unsentimental	The critic found the final scene maudlin rather than moving.
Misconstrue	Verb	To interpret something incorrectly	mis- + constru- (wrongly + build/interpret)	Misinterpret	Understand	Readers should not misconstrue the cautious conclusion as a rejection of the entire theory.
Modesty	Noun	The quality of being unassuming about one's abilities or achievements	modest- (measured)	Humility	Arrogance	Despite her major discovery, the scientist spoke about it with characteristic modesty.
Modulate	Verb	To adjust or regulate the degree, intensity, or frequency of something	modul- (measure)	Regulate	Intensify	The device automatically modulates its output as conditions change.
Monetizing	Verb	Converting an asset, activity, or resource into a source of revenue	monet- (money)	Commercializing	Giving away	The company began monetizing the platform through subscription fees.
Multifariousness	Noun	The quality of having many varied forms, elements, or aspects	multi- + fari- (many + varied)	Diversity	Uniformity	The multifariousness of the archive makes simple classification difficult.
Mutable	Adj.	Liable or able to change	mut- (change)	Changeable	Immutable	The coastline is a mutable landscape shaped by tides and storms.
Myriad	Adj./Noun	Countless or extremely numerous; a very large number	myriad- (ten thousand)	Countless	Few	The ecosystem supports a myriad of small organisms.
Neutral	Adj.	Not supporting either side; without strong positive or negative character	neutr- (neither)	Impartial	Biased	The moderator remained neutral throughout the debate.
Nominal	Adj.	Existing in name only; very small or token in amount	nomin- (name)	Token	Substantial	The membership fee is nominal and covers only basic administrative costs.
Nonchalance	Noun	Calm lack of concern or apparent indifference	non- + chal- (not heated)	Indifference	Anxiety	His nonchalance during the emergency surprised the rest of the team.
Notional	Adj.	Existing mainly as an idea or concept rather than as something concrete	not- (idea/knowledge)	Conceptual	Actual	The budget included a notional amount for expenses that had not yet been incurred.
Novelty	Noun	The quality of being new, unusual, or original	nov- (new)	Originality	Familiarity	The device attracted attention because of its novelty rather than its practical value.
Oblique	Adj.	Indirect, not straightforward, or slanting	obliqu- (slant)	Indirect	Direct	The essay makes only an oblique reference to the controversy.
Obtrusive	Adj.	Noticeable in an unwelcome or intrusive way	trud-/trus- (push)	Intrusive	Unobtrusive	The large watermark was obtrusive and distracted from the image.
Occluded	Adj./Verb	Blocked, closed off, or concealed from view	clud- (close)	Blocked	Open	Dense clouds occluded the mountain from view.
Opaque	Adj.	Not transparent; difficult to understand or interpret	opac- (dark)	Obscure	Transparent	The committee's opaque explanation raised more questions than it answered.
Orthodox	Adj.	Conforming to established or traditional beliefs or practices	ortho- + dox- (correct + belief)	Conventional	Heterodox	The scholar challenged the orthodox interpretation of the poem.
Outmoded	Adj.	No longer fashionable, useful, or appropriate	mode- (fashion/method)	Obsolete	Current	The report argues that the old classification system is outmoded.
Outspoken	Adj.	Frank and direct in expressing opinions	speak- (express)	Forthright	Reserved	She became an outspoken critic of the policy.
Overshadow	Verb	To make something seem less important, impressive, or noticeable	over- + shadow	Eclipse	Highlight	The controversy overshadowed the study's more important findings.
Partition	Noun/Verb	A division into parts; to divide into separate sections	part- (divide)	Division	Union	The treaty partitioned the territory into several administrative regions.
Perceptible	Adj.	Able to be noticed or detected	cept-/cepti- (take/perceive)	Noticeable	Imperceptible	There was a perceptible shift in tone after the new evidence was introduced.
Permeability	Noun	The degree to which a substance allows liquids or gases to pass through	me- / perme- (pass through)	Porosity	Impermeability	Soil permeability affects how quickly water reaches the roots.
Pernicious	Adj.	Having a harmful effect, especially in a gradual or subtle way	nec-/nic- (harm)	Harmful	Beneficial	The author describes misinformation as a pernicious influence on public trust.
Pertinent	Adj.	Directly relevant to the matter being considered	ten-/tin- (hold/relate)	Relevant	Irrelevant	The judge allowed only evidence pertinent to the specific charge.
Perturbation	Noun	A disturbance or small change that alters a system	turb- (disturb)	Disturbance	Stability	A slight perturbation in temperature changed the reaction rate.
Pervade	Verb	To spread throughout every part of something	vad- (go)	Permeate	Avoid	A sense of uncertainty pervades the final chapters of the novel.
Placate	Verb	To calm or satisfy someone who is angry or dissatisfied	plac- (please)	Appease	Provoke	The company offered refunds to placate frustrated customers.
Polity	Noun	An organized political community or form of government	polit- (citizen/state)	State	Anarchy	The reform altered the relationship between local institutions and the wider polity.
Portend	Verb	To indicate that something important or unpleasant is likely to happen	tend-/tent- (stretch forward)	Foreshadow	Reassure	The sudden decline in pollinators may portend broader ecological problems.
Precarious	Adj.	Not securely held or established; dangerously uncertain	prec- (entreat/uncertain)	Unstable	Secure	The species survives in a precarious habitat threatened by development.
Precede	Verb	To come before something in time, order, or position	ced- (go)	Antecede	Follow	A brief introduction precedes each chapter.
Precipitation	Noun	Water that falls from the atmosphere as rain, snow, sleet, or hail	cipit-/capit- (fall headlong)	Rainfall	Aridity	Annual precipitation varies greatly across the region.
Preclude	Verb	To prevent something from happening or make it impossible	clud- (close)	Prevent	Permit	The missing records preclude a definitive conclusion.
Precursor	Noun	A person, thing, or event that comes before and signals or leads to another	curs- (run before)	Forerunner	Successor	The early device was a precursor to modern digital cameras.
Predilection	Noun	A strong preference or liking for something	lect- (choose)	Preference	Aversion	The composer had a predilection for unusual rhythmic patterns.
Predisposition	Noun	An existing tendency or susceptibility toward a condition or behavior	pos- (place)	Inclination	Resistance	Genetic factors may create a predisposition to the disorder.
Preempt	Verb	To act before another can, especially to prevent an anticipated event	empt- (take)	Forestall	Allow	The agency acted to preempt a shortage by increasing supplies early.
Preliminary	Adj./Noun	Coming before the main action or serving as preparation	limin- (threshold)	Introductory	Final	Preliminary results suggest that the effect is smaller than expected.
Premiering	Verb	Being shown or performed publicly for the first time	prim- (first)	Debuting	Withdrawing	The documentary is premiering at the festival next month.
Pretentious	Adj.	Attempting to appear more important, sophisticated, or cultured than is justified	tend-/tent- (stretch/claim)	Affected	Unassuming	The critic found the essay pretentious because its elaborate language obscured a simple idea.
Pretext	Noun	A stated reason used to hide the real reason for an action	text- (weave/pretense)	Excuse	True motive	The inspection served as a pretext for closing the facility.
Primacy	Noun	The state of being first in importance, rank, or time	prim- (first)	Preeminence	Subordination	The article argues for the primacy of direct evidence over speculation.
Profusion	Noun	An abundant or excessive quantity of something	fus- (pour)	Abundance	Scarcity	The meadow contained a profusion of wildflowers after the rains.
Protract	Verb	To prolong or extend in time	tract- (draw)	Prolong	Shorten	Further procedural disputes could protract the negotiations for months.
Provoke	Verb	To cause a reaction, especially anger, thought, or action	voc-/provoc- (call forth)	Incite	Soothe	The unexpected result provoked renewed debate among researchers.
Proxy	Noun	A person or thing acting in place of another; an indirect measure used as a substitute	prox- (near/substitute)	Substitute	Principal	Tree-ring width can serve as a proxy for past climate conditions.
Prudent	Adj.	Showing careful judgment and concern for future consequences	prud- (foresee)	Wise	Reckless	Given the uncertainty, the committee took the prudent step of delaying the decision.
Quintessential	Adj.	Representing the most perfect or typical example of a quality or class	quint- + essent- (fifth + essence)	Archetypal	Atypical	The small café is a quintessential example of the neighborhood's character.
Quotidian	Adj.	Ordinary, everyday, or occurring daily	quotid- (daily)	Mundane	Extraordinary	The novelist transforms quotidian routines into moments of significance.
Recapitulate	Verb	To summarize or restate the main points	capit- (head/chapter)	Summarize	Elaborate	The conclusion recapitulates the study's three central findings.
Reciprocity	Noun	Mutual exchange in which each side gives or responds in return	reciproc- (back and forth)	Mutuality	One-sidedness	The agreement depends on reciprocity between the two institutions.
Reconcile	Verb	To make compatible, restore agreement, or resolve apparent differences	concili- (bring together)	Harmonize	Alienate	The new theory attempts to reconcile two seemingly conflicting sets of evidence.
Rectify	Verb	To correct something that is wrong or inaccurate	rect- (straight/right)	Correct	Worsen	The researchers rectified the coding error before analyzing the data again.
Redundancy	Noun	Unnecessary repetition or duplication; a backup element that improves reliability	und-/redund- (overflow)	Duplication	Necessity	The editor removed redundancy from the final paragraph.
Regale	Verb	To entertain someone with stories, conversation, or lavish attention	regal- (entertain)	Entertain	Bore	The historian regaled the audience with stories from the expedition.
Reiterate	Verb	To say or do something again, often for emphasis	iter- (again)	Repeat	Retract	The report reiterates the need for additional evidence.
Repertory	Noun	A stock or collection of works, skills, or items available for use	repert- (find/store)	Repertoire	Scarcity	The theater's repertory includes both classical and contemporary plays.
Reprisal	Noun	An act of retaliation in response to an injury or offense	pris- (take back)	Retaliation	Forgiveness	Officials feared that the sanction would trigger a reprisal.
Repudiated	Verb	Formally rejected, denied, or disowned	repudi- (reject)	Rejected	Accepted	The organization repudiated the earlier statement after new evidence emerged.
Resolute	Adj.	Firmly determined and unwavering	solut-/solv- (loosen/resolve)	Determined	Wavering	She remained resolute despite repeated pressure to abandon the project.
Restitution	Noun	The restoration of something lost or stolen, or compensation for loss	stitu- (set/restore)	Compensation	Deprivation	The settlement required restitution to the communities that had lost the artifacts.
Retrospect	Noun	A review or consideration of past events	retro- + spect- (back + look)	Hindsight	Foresight	In retrospect, the early warning signs were easier to recognize.
Rigor	Noun	Strictness, precision, and thoroughness in thought or method	rig- (stiff/strict)	Precision	Laxity	The study was praised for its methodological rigor.
Sanction	Noun/Verb	Official permission or approval; also a penalty imposed to enforce a rule	sanct- (make sacred/authorize)	Authorize	Forbid	The agency would not sanction the project until safety concerns were addressed.
Satirize	Verb	To use humor, irony, or exaggeration to criticize	satir- (satire)	Mock	Praise	The novel satirizes the social pretensions of the wealthy.
Scarcely	Adverb	Barely; only just; hardly	scarce- (few)	Barely	Abundantly	The two versions are scarcely distinguishable without close inspection.
Sentimental	Adj.	Strongly influenced by tender, nostalgic, or emotional feelings	sent- (feel)	Emotional	Unsentimental	The memoir is reflective without becoming overly sentimental.
Situate	Verb	To place something in a particular physical, historical, or conceptual context	situ- (place)	Locate	Displace	The introduction situates the debate within its broader historical context.
Sophist	Noun	A person who uses clever but misleading arguments; historically, a teacher of rhetoric	soph- (wisdom)	Quibbler	Truth-seeker	The critic accused the speaker of arguing like a sophist rather than addressing the evidence.
Sophisticated	Adj.	Complex, refined, or highly developed	soph- (wisdom)	Advanced	Rudimentary	The model uses a sophisticated method to account for missing data.
Sporadic	Adj.	Occurring at irregular intervals or in scattered instances	sporad- (scattered)	Intermittent	Continuous	Reports of the phenomenon were sporadic rather than consistent.
Steward	Noun/Verb	A person who manages or protects something entrusted to their care; to manage responsibly	steward- (manager)	Custodian	Neglector	The curator viewed herself as a steward of the collection rather than its owner.
Stipulate	Verb	To specify a condition or requirement explicitly	stipul- (condition)	Specify	Leave unspecified	The contract stipulates that all data must remain confidential.
Subdue	Verb	To bring under control or reduce in intensity	sub- + duc- (under + lead)	Suppress	Intensify	The medication helped subdue the inflammatory response.
Subordinate	Adj./Verb	Lower in rank or importance; to place in a lower position	ordin- (order/rank)	Secondary	Dominant	The author treats economic factors as subordinate to political ones.
Substantiate	Verb	To support a claim with evidence or proof	stant- (stand)	Corroborate	Refute	The researchers needed additional data to substantiate their conclusion.
Subsume	Verb	To include or absorb something within a broader category	sum- (take/include)	Include	Separate	The classification subsumes several related species under one larger group.
Subtlety	Noun	A fine distinction, delicate quality, or complexity that may be difficult to notice	subtil- (fine)	Nuance	Obviousness	The translation preserves the subtlety of the original metaphor.
Succession	Noun	A sequence in which one person, thing, or event follows another	ced-/cess- (go)	Sequence	Interruption	A succession of storms delayed the expedition.
Superfluous	Adj.	More than is needed; unnecessary	flu- (flow)	Unnecessary	Essential	The editor removed several superfluous examples from the paragraph.
Supersede	Verb	To replace something that is older, less effective, or no longer used	sed- (sit)	Replace	Retain	The new standard will supersede the earlier guideline.
Supplant	Verb	To take the place of something or someone, often by force or through competition	plant- (place)	Replace	Preserve	Digital records gradually supplanted paper files.
Surmount	Verb	To overcome a difficulty or rise above an obstacle	mount- (rise)	Overcome	Succumb to	The team surmounted several technical obstacles before completing the project.
Synopsis	Noun	A brief summary of the main points of a work	syn- + ops- (together + view)	Summary	Full account	The proposal begins with a one-page synopsis of the research plan.
Synthesis	Noun	The combination of separate ideas or elements into a coherent whole	syn- + thes- (together + put)	Integration	Separation	The article offers a synthesis of findings from several disciplines.
Tantamount	Adj.	Equivalent in effect, value, or seriousness to something else	tant- (so much)	Equivalent	Different	Ignoring the warning would be tantamount to accepting the risk.
Tentative	Adj.	Not certain or final; provisional	tent- (try/test)	Provisional	Definitive	The researchers offered a tentative explanation pending further study.
Testament	Noun	Evidence or proof of a fact, quality, or condition	test- (witness)	Evidence	Refutation	The building's survival is a testament to the durability of its design.
Transpose	Verb	To change the position or order of two or more things	pos- (place)	Rearrange	Retain	The editor accidentally transposed two figures in the table.
Truncate	Verb	To shorten by cutting off a part	trunc- (cut off)	Shorten	Extend	The display truncates long titles to fit the available space.
Unambiguous	Adj.	Clear and having only one reasonable interpretation	ambigu- (uncertain)	Clear	Ambiguous	The instructions were unambiguous about the submission deadline.
Underpinned	Verb	Supported or formed the basis of something	pin- (support)	Supported	Undermined	A large body of evidence underpinned the policy recommendation.
Unfounded	Adj.	Not supported by evidence or fact	found- (base)	Baseless	Substantiated	The investigation concluded that the allegation was unfounded.
Universal	Adj.	Applying to all cases, people, or things within a category	univers- (whole)	General	Limited	The pattern is common but not universal across all species.
Unnerved	Adj./Verb	Made anxious, unsettled, or less confident	nerve- (courage)	Unsettled	Reassured	The unexpected question unnerved the otherwise confident speaker.
Unsubstantiated	Adj.	Not supported by evidence or proof	stant- (stand)	Unsupported	Verified	The article repeated an unsubstantiated claim from an anonymous source.
Unsympathetic	Adj.	Not showing understanding, support, or favorable feeling	path- (feeling)	Uncompassionate	Sympathetic	The review was unsympathetic to arguments that lacked evidence.
Untenable	Adj.	Unable to be defended, maintained, or justified	ten- (hold)	Indefensible	Defensible	Once the contradictory data emerged, the original explanation became untenable.
Utilitarian	Adj.	Designed mainly for practical use rather than beauty; relating to utility	util- (use)	Practical	Ornamental	The building's utilitarian design prioritized function over decoration.
Vindictive	Adj.	Having a strong desire for revenge	vind-/vindic- (avenge/claim)	Vengeful	Forgiving	The narrator's vindictive response seems disproportionate to the minor insult.
Visionary	Adj./Noun	Showing imaginative foresight; a person with original ideas about the future	vis- (see)	Far-sighted	Shortsighted	The proposal was visionary in anticipating technologies that did not yet exist.
Wrought	Adj./Verb	Worked, shaped, or produced with effort; past form of work in certain uses	work-/wrought- (work)	Fashioned	Unworked	The intricate gate was wrought from iron by local artisans.
Yield	Verb/Noun	To produce or provide a result; to give way under pressure	yield- (give/produce)	Produce	Withhold	The experiment yielded results consistent with the earlier study.