Online English Vocabulary Flashcards for ACT 12 (American College Testing) Words

adverse (adjective) /ædˈvɜrs/
Definition: Unfavorable, harmful, or detrimental to a particular situation, individual, or outcome.
Example Sentence: "She was concerned about the adverse effects of technology on children's development."
Synonyms: contrary; damaging; dangerous; deleterious; destructive; detrimental
Opposite Meaning: beneficial

affected (adjective) /əˈfɛktɪd/
Definition: Appearing to be unnatural, exaggerated, or insincere, often in an attempt to project a certain image or impression.
Example Sentence: "His affected accent made it clear that he was trying to impress the guests."
Synonyms: affectedly; artificial; contrived; counterfeit; feigned; insincere
Opposite Meaning: natural

affluent (adjective) /ˈaflʊənt/
Definition: Possessing considerable wealth, prosperity, or financial resources.
Example Sentence: "The affluent resort was filled with amenities and activities for its wealthy guests."
Synonyms: comfortable; flush; loaded; moneyed; opulent; prosperous
Opposite Meaning: impoverished

agonize (verb) /ˈaɡənʌɪz/
Definition: To experience intense mental or emotional suffering, often as a result of a difficult decision or situation.
Example Sentence: "He started to agonize about the possible outcomes of the surgery."
Synonyms: anguish; bedevil; exasperate; excruciate; harrow; plague
Opposite Meaning: rejoice

albino (noun) /ælˈbiːnoʊ/
Definition: A person or animal who lacks pigment in their skin, hair, and eyes due to a genetic mutation.
Example Sentence: "The albino alligator was a rare sight in the wild."
Synonyms: achromatic; bleached; colorless; faded; ghostly; ivory
Opposite Meaning: pigmented

amicable (adjective) /ˈamɪkəbl/
Definition: Having a friendly and cooperative relationship between individuals or parties.
Example Sentence: "The two sides reached an amicable settlement in court."
Synonyms: affable; agreeable; amiable; civil; companionable; conciliatory
Opposite Meaning: hostile

antennae (noun) /ænˈtɛniː/
Definition: The paired sensory organs found on the heads of many insects and some other arthropods.
Example Sentence: "The cricket used its antennae to detect the vibrations of nearby predators."
Synonyms: aerials; detectors; feelers; flagella; palp; perceptors
Opposite Meaning: non-sensory

apoplectic (adjective) /ˌapəˈplɛktɪk/
Definition: Extreme anger, agitation, or fury, often to the point of near uncontrollable rage.
Example Sentence: "The family is apoplectic at the government's handling of the hostage crisis."
Synonyms: berserk; boiling; enraged; fuming; furious; incandescent
Opposite Meaning: calm

auditorium (noun) /ˌɔːdɪˈtɔːrɪəm/
Definition: A large, enclosed space specifically designed for hosting public performances, speeches, lectures, and other events.
Example Sentence: "The auditorium was filled with eager students waiting for the speaker."
Synonyms: amphitheater; arena; chamber; coliseum; hall; stadium
Opposite Meaning: cupboard

auxiliary (adjective) /ɔːɡˈzɪlɪəri/
Definition: Providing additional or supplementary support or assistance.
Example Sentence: "The auxiliary staff helped with registration at the conference."
Synonyms: additional; ancillary; assisting; helping; peripheral; secondary
Opposite Meaning: main

avoidance (noun) /əˈvɔɪd ns/
Definition: The act or practice of intentionally staying away from or evading someone, something, or a particular situation.
Example Sentence: "Avoidance of conflict often leads to unresolved issues and misunderstandings."
Synonyms: abstinence; circumvention; dodging; elusion; escape; evasion
Opposite Meaning: confrontation

bargain (noun) /ˈbɑr gən/
Definition: A mutually beneficial agreement or deal reached between two or more parties.
Example Sentence: "The local farmers' market is a fantastic place to get fresh produce at bargain prices."
Synonyms: agreement; arrangement; contract; deal; discount; negotiation
Opposite Meaning: rip-off

budget (noun) /ˈbʌdʒ ɪt/
Definition: A financial plan or estimate that outlines the expected income and expenses of an individual, organization, or government entity over a specific period.
Example Sentence: "My monthly budget helps me track my expenses and stay within my financial limits."
Synonyms: account; allocation; allowance; balance; economy; estimate
Opposite Meaning: extravagance

bulbous (adjective) /ˈbʌlbəs/
Definition: Having a round, swollen, or bulb-shaped appearance, often resembling a bulb.
Example Sentence: "The frog had bulbous eyes that protruded from its head."
Synonyms: balled; bloated; bowed; circular; convex; curved
Opposite Meaning: flat

bumbling (adjective) /ˈbʌmbəlɪŋ/
Definition: Exhibiting a lack of coordination, clumsiness, and a tendency to make mistakes or blunders, often in a well-intentioned but somewhat ineffective manner.
Example Sentence: "The bumbling attempts to fix the problem only made it worse."
Synonyms: botching; bungling; butchering; fluffing; fumbling; lumbering
Opposite Meaning: adept

buoyant (adjective) /ˈbɔɪənt/
Definition: Having the ability to float or rise in a fluid, typically due to an inherent lightness or the upward force exerted by the surrounding liquid.
Example Sentence: "The boat remained buoyant despite the strong waves crashing against it."
Synonyms: bouncy; cheerful; expanding; joyful; light; lively
Opposite Meaning: heavy

callous (adjective) /ˈkæl əs/
Definition: Emotionally hardened or unfeeling, showing no sympathy or consideration for others.
Example Sentence: "The callous behavior of the bully made the victim feel helpless."
Synonyms: apathetic; brutal; cold; harsh; heartless; inconsiderate
Opposite Meaning: compassionate

capacity (noun) /kəˈpæs ɪ ti/
Definition: The maximum amount that something can hold, contain, or produce.
Example Sentence: "The capacity of the stadium was increased to accommodate more fans."
Synonyms: capability; dimensions; extent; magnitude; measure; quota
Opposite Meaning: emptiness

commiseration (noun) /kəˌmɪzəˈreɪʃn/
Definition: An expression of sympathy or compassion towards someone who is experiencing distress or suffering.
Example Sentence: "The politician expressed his commiseration to the families of the flood victims."
Synonyms: condolence; consolation; empathy; humanity; kindness; magnanimity
Opposite Meaning: indifference

compound (adjective) /ˈkɒm paʊnd/
Definition: Composed or made up of two or more separate elements or parts.
Example Sentence: "The compound fracture required immediate medical attention."
Synonyms: amalgamated; blended; complex; composite; entwined; fused
Opposite Meaning: simple

conducive (adjective) /kənˈdusɪv/
Definition: Favorable or beneficial for a particular outcome or activity.
Example Sentence: "A positive attitude is conducive to success in any endeavor."
Synonyms: advantageous; appropriate; beneficial; constructive; encouraging; facilitative
Opposite Meaning: hindering

confer (verb) confer/kənˈfəː/
Definition: To discuss or consult with someone to come to a decision or make a judgement about a particular matter.
Example Sentence: "The team will confer before the game to finalize their strategy."
Synonyms: brainstorm; confabulate; converse; counsel; deliberate; discourse
Opposite Meaning: ignore

configuration (noun) /kənˌfɪg yəˈreɪ ʃən/
Definition: The arrangement, structure, or organization of elements or components within a system, object, or concept.
Example Sentence: "The technician adjusted the configuration of the network routers for improved connectivity."
Synonyms: arrangement; composition; design; format; formation; layout
Opposite Meaning: disorganization

consistent (adjective) /kənˈsɪst(ə)nt/
Definition: Steady, regular, and predictable in behavior, performance, or quality.
Example Sentence: "The team's consistent performance earned them a spot in the playoffs."
Synonyms: concordant; congruous; constant; dependable; persistent; stable
Opposite Meaning: erratic

contribution (noun) /ˌkɒn trəˈbyu ʃən/
Definition: Something given, offered, or provided to a cause, effort, or endeavor.
Example Sentence: "He made a meaningful contribution to the discussion with his insightful comments."
Synonyms: aid; assistance; benefaction; donation; endowment; gift
Opposite Meaning: hindrance

credential (noun) /krɪˈdɛnʃl/
Definition: A qualification, skill, or ability that a person has that make them suitable for a particular job or task.
Example Sentence: "The credential was a key requirement for attending the conference."
Synonyms: accomplishment; aptitude; attribute; capability; capacity; certification
Opposite Meaning: disqualification

devaluate (verb) /diˈvæl yuˌeɪt/
Definition: To reduce or lower the value or worth of something, typically a currency or an asset.
Example Sentence: "Inflation can devaluate the purchasing power of a nation's currency."
Synonyms: belittle; cheapen; deflate; depreciate; deteriorate; diminish
Opposite Meaning: appreciate

disown (verb) /dɪsˈoʊn/
Definition: To refuse to acknowledge or accept a connection or relationship with someone or something that was previously considered as one's own.
Example Sentence: "The family chose to disown their son when he refused to follow their traditional values."
Synonyms: abandon; detach; disavow; discard; disclaim; dissociate
Opposite Meaning: acknowledge

dispose (verb) /dɪˈspoʊz/
Definition: To get rid of something or to discard it properly.
Example Sentence: "The company hired a professional to dispose of hazardous materials safely."
Synonyms: discard; dump; eliminate; expel; jettison; relinquish
Opposite Meaning: keep

dominance (noun) /ˈdɒm ə nəns/
Definition: A state or condition of having control, authority, or power over others.
Example Sentence: "The lion asserted its dominance over the pride by roaring loudly."
Synonyms: ascendancy; authority; command; control; influence; leadership
Opposite Meaning: subservience

dormant (adjective) /ˈdɔːm(ə)nt/
Definition: Referring to a state of inactivity, slumber, or temporary suspension of growth or action.
Example Sentence: "The volcano is currently dormant but may erupt at any time."
Synonyms: asleep; comatose; hibernating; lurking; quiescent; resting
Opposite Meaning: active

empathy (noun) /ˈɛmpəθi/
Definition: The ability to understand and share the feelings of others.
Example Sentence: "The therapist's empathy towards the patient helped them feel understood."
Synonyms: communion; compassion; feeling; insight; rapport; recognition
Opposite Meaning: apathy

enclosure (noun) /ɛnˈkloʊ ʒər/
Definition: A defined area or space that is surrounded or enclosed by a physical barrier, such as walls, fences, or hedges.
Example Sentence: "The garden had a beautiful flower enclosure with a variety of vibrant blooms."
Synonyms: barrier; blockade; cage; compartment; confinement; container
Opposite Meaning: openness

equatorial (adjective) /ˌɛkwəˈtɔːrɪəl/
Definition: Located near or at the Earth's equator, which is the imaginary line that encircles the Earth and divides it into two hemispheres
Example Sentence: "The equatorial region is known for its high temperatures and heavy rainfall."
Synonyms: fecund; humid; lush; subtropical; sultry; sweltering
Opposite Meaning: polar

exposure (noun) /ɪkˈspoʊ ʒər/
Definition: The state or condition of being subjected to or experiencing something, typically involving the contact or interaction with external elements, influences, or situations.
Example Sentence: "Her frequent exposure to different cultures broadened her perspective on the world."
Synonyms: demonstration; disclosure; display; divulgence; exhibition; manifestation
Opposite Meaning: protection

extract (verb) /ˈɛkˌstrækt/
Definition: To remove, draw out, or obtain something, often by a deliberate and systematic process.
Example Sentence: "The dentist gently used a tool to extract the decayed tooth."
Synonyms: derive; draw; elicit; exact; gather; glean
Opposite Meaning: insert

flourish (verb) /ˈflʌrɪʃ/
Definition: To thrive, prosper, or grow vigorously, often characterized by a state of health, success, or abundance.
Example Sentence: "The small town began to flourish after a new factory was built."
Synonyms: advance; bloom; blossom; boom; burgeon; develop
Opposite Meaning: fail

harlequin (noun) /ˈhɑr lə kwɪn/
Definition: A comedic servant or clown-like figure.
Example Sentence: "With a mischievous grin, the harlequin played a prank on the unsuspecting traveler."
Synonyms: buffoon; clown; comedian; fool; jester; joker
Opposite Meaning: tragedian

immeasurable (adjective) /ɪˈmɛʒ ər ə bəl/
Definition: Cannot be measured or quantified accurately due to its vastness, extent, or magnitude.
Example Sentence: "The immeasurable beauty of the mountains took my breath away."
Synonyms: boundless; endless; immense; incalculable; inexhaustible; infinite
Opposite Meaning: limited

indecent (adjective) /ɪnˈdi sənt/
Definition: Offensive, inappropriate, or morally offensive, typically in terms of behavior, language, or appearance.
Example Sentence: "The television show was criticized for its indecent language and explicit content."
Synonyms: disgraceful; immoral; improper; indecorous; lewd; obscene
Opposite Meaning: decent

indecisive (adjective) /ˌɪndɪˈsaɪsɪv/
Definition: Difficulty making decisions, often hesitating or vacillating between different options or choices.
Example Sentence: "The indecisive manager struggled to make important decisions for the company."
Synonyms: dithering; doubtful; faltering; reluctant; tentative; uncertain
Opposite Meaning: resolute

infertile (adjective) /ɪnˈfɜr tl/
Definition: Unable to produce or support the growth of offspring, crops, or reproductive processes.
Example Sentence: "The farmer struggled with infertile land, leading to a decline in agricultural productivity."
Synonyms: barren; fruitless; impotent; nonfertile; nonproductive; sterile
Opposite Meaning: fertile

inhale (verb) /ɪnˈheɪl/
Definition: To breath in or draw air or another substance into the lungs.
Example Sentence: "The yoga instructor instructed the students to inhale deeply and exhale slowly."
Synonyms: breathe; draw; gasp; gulp; inspire; respire
Opposite Meaning: exhale

jettison (verb) /ˈdʒɛtɪs(ə)n/
Definition: To discard or get rid of something, often in a hasty or deliberate manner, in order to lighten a load, reduce excess, or eliminate unwanted elements.
Example Sentence: "The politician was forced to jettison his controversial policy."
Synonyms: abandon; desert; discard; dump; expel; forsake
Opposite Meaning: retain

jubilant (adjective) /ˈdʒu bə lənt/
Definition: Extreme joy, triumph, or exultation.
Example Sentence: "The jubilant crowd erupted in cheers as their team scored the winning goal."
Synonyms: blissful; ecstatic; elated; exhilarated; exuberant; gleeful
Opposite Meaning: dejected

liveliness (noun) /ˈlaɪvlɪnəs/
Definition: The quality or state of being animated, energetic, and full of enthusiasm.
Example Sentence: "The liveliness of the crowd at the concert created an electric atmosphere."
Synonyms: animation; buoyancy; dynamism; energy; enthusiasm; exuberance
Opposite Meaning: lethargy

lull (noun) /lʌl/
Definition: A temporary period of calm, quiet, or reduced activity, often following a period of heightened activity or disturbance.
Example Sentence: "The lull in the storm allowed the rescue team to reach the stranded hikers."
Synonyms: break; breather; cessation; interim; interlude; intermission
Opposite Meaning: surge

maniac (noun) /ˈmeɪ niˌæk/
Definition: An individual who displays extreme and often irrational behavior characterized by an obsession, frenzy, or madness.
Example Sentence: "The horror movie featured a deranged maniac terrorizing the town."
Synonyms: extremist; fanatic; hothead; lunatic; lunger; madman
Opposite Meaning: sane person

mannerism (noun) /ˈmanərɪz(ə)m/
Definition: A way of behaving or speaking that is distinctive and characteristic of a particular person or group.
Example Sentence: "The athlete's victory pose had become a well-known mannerism after each win."
Synonyms: characteristic; eccentricity; foible; habit; idiosyncrasy; oddity
Opposite Meaning: spontaneity

metabolism (noun) /məˈtæb əˌlɪz əm/
Definition: The set of biochemical processes that occur within an organism to sustain life.
Example Sentence: "Metabolism is the process by which your body converts food into energy."
Synonyms: anabolism; assimilation; biochemistry; breakdown; catabolism; conversion
Opposite Meaning: inactivity

millennia (noun) /mɪˈlɛnɪə/
Definition: Denoting a span of one thousand years or multiple periods of a thousand years.
Example Sentence: "The Great Pyramid of Giza has stood for over four millennia."
Synonyms: aeons; ages; centuries; cycles; durations; eons
Opposite Meaning: seconds

miscellany (noun) /ˈmɪs əˌleɪ ni/
Definition: A collection or mixture of various diverse or unrelated things, often presented together in a single work or publication.
Example Sentence: "The box contained a delightful miscellany of handwritten letters, postcards, and photographs."
Synonyms: assortment; collection; diversity; hodgepodge; jumble; medley
Opposite Meaning: uniformity

nitpick (verb) /ˈnɪtˌpɪk/
Definition: To find and focus on minor or insignificant faults, flaws, or details in a critical or overly meticulous manner.
Example Sentence: "My friend loves to nitpick at grammar mistakes in social media posts."
Synonyms: arp; cavil; complain; criticize; fuss; gripe
Opposite Meaning: praise

oath (noun) /oʊθ/
Definition: A solemn, formal, and binding declaration made by an individual, often invoking a divine power or an entity of great significance.
Example Sentence: "The doctor took an oath to prioritize patient well-being and uphold medical ethics."
Synonyms: affirmation; assurance; bond; commitment; covenant; declaration
Opposite Meaning: betrayal

obliged (adjective) /əˈblaɪdʒd/
Definition: Morally or legally bound to do something or to fulfill a responsibility or duty.
Example Sentence: "He felt obliged to return the favor after his friend helped him move."
Synonyms: beholden; bound; compelled; constrained; forced; indebted
Opposite Meaning: unobligated

offensive (adjective) /əˈfɛn sɪv/
Definition: Likely to cause displeasure, hurt, or annoyance, particularly due to its explicit, disrespectful, or inappropriate nature.
Example Sentence: "The offensive remarks written in the online forum ignited a heated debate among users."
Synonyms: abusive; crude; disrespectful; distasteful; indecent; insulting
Opposite Meaning: pleasant

oppressed (adjective) /əˈprɛst/
Definition: Being subjected to unjust and cruel treatment, control, or domination by an individual, group, or system.
Example Sentence: "She lived in an oppressed society where freedom of expression was heavily restricted."
Synonyms: beleaguered; disadvantaged; downtrodden; enslaved; marginalized; mistreated
Opposite Meaning: liberated

perch (verb) /pɜrtʃ/
Definition: To rest or settle on a high or narrow surface, often with the use of a support such as a branch, ledge, or perch itself.
Example Sentence: "The hiker found a comfortable rock to perch on and rest for a while."
Synonyms: alight; balance; land; mount; nestle; position
Opposite Meaning: descend

pioneering (adjective) /ˌpaɪ əˈnɪər ɪŋ/
Definition: Characterized by being innovative, groundbreaking, or leading the way in a particular field or endeavor.
Example Sentence: "Thomas Edison's pioneering inventions, such as the phonograph and the electric light bulb, transformed everyday life."
Synonyms: avant-garde; experimental; groundbreaking; innovative; inventive; original
Opposite Meaning: unoriginal

poltergeist (noun) /ˈpoʊl tərˌgaɪst/
Definition: A supernatural entity or spirit characterized by its mischievous and disruptive behavior.
Example Sentence: "The poltergeist's antics included knocking over furniture and slamming doors in the middle of the night."
Synonyms: apparition; entity; ghost; haunt; phantom; presence
Opposite Meaning: calm

polygon (noun) /ˈpɒlɪɡ(ə)n/
Definition: A two-dimensional geometric shape that is bound by straight sides.
Example Sentence: "The architect designed a building with a complex polygon-shaped facade."
Synonyms: heptagon; hexagon; nonagon; octagon; pentagon; quadrilateral
Opposite Meaning: curve

precipitation (noun) /prɪˌsɪpɪˈteɪʃn/
Definition: The various forms of water that fall from the atmosphere, such as rain, snow, sleet, and hail.
Example Sentence: "The high level of precipitation caused the river to flood."
Synonyms: cloudburst; condensation; deluge; downpour; drizzle; flurry
Opposite Meaning: dryness

projectile (noun) /prəˈdʒɛktʌɪl/
Definition: An object that is propelled through the air, typically by some kind of force or energy.
Example Sentence: "The projectile struck the target with a loud thud."
Synonyms: ammunition; ball; bullet; cannonball; cap; cartridge
Opposite Meaning: stationary

prominent (adjective) /ˈprɒmɪnənt/
Definition: Easily noticeable, conspicuous, or widely recognized due to its distinctiveness, importance, or visibility.
Example Sentence: "She was a prominent writer, with many bestselling books and articles to her credit."
Synonyms: distinguished; esteemed; famed; famous; influential; leading
Opposite Meaning: obscure

readiness (noun) /ˈrɛdinɪs/
Definition: A state of being prepared, eager, or willing to take action or engage in a particular task or situation.
Example Sentence: "Her readiness to learn new skills made her a valuable asset to the company."
Synonyms: adaptability; alertness; availability; eagerness; initiative; preparedness
Opposite Meaning: unpreparedness

redundant (adjective) /rɪˈdʌnd(ə)nt/
Definition: No longer necessary or useful due to being excessive, surplus, or having been replaced by more efficient alternatives.
Example Sentence: "The old computer hardware became redundant after the upgrade."
Synonyms: excess; extra; inessential; spare; superfluous; surplus
Opposite Meaning: essential

replenish (verb) /rɪˈplɛnɪʃ/
Definition: To fill or restore something that has been depleted, exhausted, or used up, typically with the intention of bringing it back to its original or desired level.
Example Sentence: "The athlete had to replenish his electrolytes after a strenuous workout."
Synonyms: furnish; refill; refresh; reload; renew; repack
Opposite Meaning: deplete

revoke (verb) /rɪˈvəʊk/
Definition: To take back or withdraw a privilege, permission, or authorization that has been granted.
Example Sentence: "The judge will revoke his license after the incident."
Synonyms: abolish; annul; cancel; invalidate; quash; recall
Opposite Meaning: grant

spoiled (adjective) /spɔɪld/
Definition: Having been excessively indulged, pampered, or given excessive attention or privileges, often resulting in a lack of appreciation or understanding of the value of things.
Example Sentence: "The dog is so spoiled; it only eats gourmet food."
Synonyms: bratty; coddled; entitled; indulged; overgratified; overindulged
Opposite Meaning: disciplined

supersede (verb) /ˌsuːpəˈsiːd/
Definition: To replace or displace something or someone with a newer, better, or more advanced alternative.
Example Sentence: "New technology will supersede the outdated system."
Synonyms: displace; oust; overrule; relieve; remove; substitute
Opposite Meaning: retain

transfer (verb) /trænsˈfɜr/
Definition: To move or convey something or someone from one place, person, or situation to another.
Example Sentence: "I need to transfer money from my savings account to my checking account."
Synonyms: convey; deliver; exchange; forward; move; pass
Opposite Meaning: retain

unshakable (adjective) /ʌnˈʃeɪkəbl/
Definition: Firmly fixed, resolute, and steadfast, and cannot be easily disturbed, altered, or weakened.
Example Sentence: "The soldier's unshakable loyalty to his country was admirable."
Synonyms: composed; determined; firm; immovable; imperturbable; relentless
Opposite Meaning: vacillating

uplifting (adjective) /ʌpˈlɪf tɪŋ/
Definition: Bringing about a positive emotional or spiritual uplift, elevating one's mood, spirits, or overall outlook.
Example Sentence: "The book's uplifting message of resilience resonated deeply with me."
Synonyms: buoyant; encouraging; energizing; heartening; inspiring; invigorating
Opposite Meaning: depressing

wary (adjective) /ˈwɛər i/
Definition: Cautious, alert, or vigilant due to potential risks, dangers, or suspicions.
Example Sentence: "After the break-in, she became wary of leaving her house unattended."
Synonyms: alert; apprehensive; careful; cautious; circumspect; distrustful
Opposite Meaning: careless

withhold (verb) /wɪθˈhoʊld/
Definition: To deliberately hold back, refuse, or abstain from giving or providing something that is expected, deserved, or requested.
Example Sentence: "He chose to withhold his true feelings and kept a neutral expression."
Synonyms: abstain; conceal; deny; hide; keep; mute
Opposite Meaning: disclose