Online English Vocabulary Flashcards for High School 16 Words

additional (adjective) /əˈdɪʃ ə nl/
Definition: Added or supplementary to what already exists or is present.
Example Sentence: "She added an additional paragraph to the report to provide more context."
Synonyms: added; ancillary; bonus; complementary; extra; further
Opposite Meaning: subtractive

affiliation (noun) /əˌfɪl iˈeɪ ʃən/
Definition: The formal or informal association or connection that an individual or organization has with a particular group, institution, or cause.
Example Sentence: "Her affiliation with the university granted her access to exclusive research opportunities."
Synonyms: alliance; association; attachment; bond; collaboration; connection
Opposite Meaning: detachment

affix (verb) /əˈfɪks/
Definition: To attach, fasten, or join something to another object or surface.
Example Sentence: "You must affix a stamp to the envelope before mailing it."
Synonyms: adhere; attach; bind; bond; connect; fasten
Opposite Meaning: detach

agitate (verb) /ˈædʒ ɪˌteɪt/
Definition: To stir, disturb, or cause unrest or dissatisfaction in someone or something.
Example Sentence: "The rumor about layoffs began to agitate the staff."
Synonyms: discompose; disquiet; disturb; foment; incite; inflame
Opposite Meaning: calm

alma-mater (noun) /ˌalmə ˈmɑːtə/
Definition: The school, college, or university that an individual attended and graduated from.
Example Sentence: "He returned to his alma mater to give a speech to the students."
Synonyms: academe; academy; alma; college; institute; institution
Opposite Meaning: non-graduate

anxious (adjective) /ˈæŋk ʃəs/
Definition: Unease, worry, or apprehension, typically caused by an uncertain or potentially challenging situation.
Example Sentence: "He grew increasingly anxious as the deadline approached."
Synonyms: agitated; apprehensive; concerned; edgy; fretful; jumpy
Opposite Meaning: calm

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

astounded (adjective) /əsˈtaʊndɪd/
Definition: To be greatly surprised, shocked, or astonished.
Example Sentence: "He was astounded to discover a hidden treasure buried in his backyard."
Synonyms: amazed; astonished; awed; dumbfounded; flabbergasted; floored
Opposite Meaning: unsurprised

available (adjective) /əˈveɪ lə bəl/
Definition: Accessible, obtainable, or ready for use or acquisition.
Example Sentence: "Fresh produce is now available at the local farmer's market."
Synonyms: accessible; attainable; free; obtainable; open; reachable
Opposite Meaning: unavailable

blockchain (noun) /ˈblɒkˌtʃeɪn/
Definition: A decentralized and distributed digital ledger or database that records transactions across multiple computers or nodes in a secure and transparent manner.
Example Sentence: "The use of blockchain has revolutionized the world of cryptocurrencies."
Synonyms: chain; crypto; cryptocurrency; database; decentralized; digital
Opposite Meaning: disorganization

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

complimentary (adjective) /ˌkɒm pləˈmɛn tə ri/
Definition: Given or provided without charge or as a gesture of goodwill.
Example Sentence: "The restaurant greeted us with a complimentary glass of champagne."
Synonyms: adulatory; appreciative; commendatory; costless; courtesy; flattering
Opposite Meaning: costly

confluent (adjective) /ˈkɒnflʊənt/
Definition: Flowing together or merging smoothly and seamlessly.
Example Sentence: "The workshop aimed to facilitate a confluent exchange of ideas and perspectives."
Synonyms: blended; coalesced; cohesive; combined; fused; harmonious
Opposite Meaning: diverging

conjugate (adjective) /ˈkɑnʤəɡɪt/
Definition: Pertaining to the grammatical relationship between words, particularly verbs, within a sentence or clause.
Example Sentence: "The teacher asked the students to conjugate the verb 'to be' in past tense."
Synonyms: adjoin; associate; bind; coalesce; combine; compound
Opposite Meaning: unrelated

constant (adjective) /ˈkɒn stənt/
Definition: Remaining consistent, unchanging, or persistent over time.
Example Sentence: "The ticking of the clock provided a constant reminder of the passing time."
Synonyms: consistent; continual; enduring; incessant; perpetual; persistent
Opposite Meaning: variable

crinkle (verb) /krɪŋkəl/
Definition: To create or cause small, sharp, and irregular folds or wrinkles in a material or surface.
Example Sentence: "If you crinkle the fabric before sewing, it adds an interesting texture to the garment."
Synonyms: crease; crumple; crunch; distort; fold; pucker
Opposite Meaning: smooth

disaffected (adjective) /ˌdɪs əˈfɛk tɪd/
Definition: Discontent, dissatisfaction, or disillusionment with a person, group, organization, or system that one was once associated with or had loyalty towards.
Example Sentence: "His disaffected demeanor made it clear that he no longer felt a connection to the company’s goals."
Synonyms: alienated; discontented; disenchanted; disgruntled; disillusioned; dissatisfied
Opposite Meaning: content

disembark (verb) /dɪsɛmˈbɑrk/
Definition: To exit or leave a vehicle, particularly a ship, airplane, or other mode of transportation.
Example Sentence: "The flight attendant announced that it was safe to disembark the airplane."
Synonyms: alight; debark; deplane; disembarkation; disengage; dismount
Opposite Meaning: board

disgraceful (adjective) /dɪsˈgreɪs fəl/
Definition: Deeply shameful, dishonorable, or morally offensive.
Example Sentence: "The judge's biased and unjust ruling was seen as disgraceful by many observers in the courtroom."
Synonyms: abhorrent; deplorable; despicable; dishonorable; ignominious; inexcusable
Opposite Meaning: honorable

dusk (noun) /dʌsk/
Definition: The period of time between daylight and darkness, specifically the twilight that occurs after sunset and before full nightfall.
Example Sentence: "The fireflies began to illuminate the garden as dusk settled in."
Synonyms: crepuscule; darkness; dimness; eve; evenfall; eventide
Opposite Meaning: dawn

establish (verb) /ɪˈstablɪʃ/
Definition: To create, found, or set up something with a particular purpose or goal in mind.
Example Sentence: "The entrepreneur worked hard to establish her own business."
Synonyms: begin; inaugurate; initiate; introduce; launch; organize
Opposite Meaning: demolish

extinguish (verb) /ɪkˈstɪŋɡwɪʃ/
Definition: To put out or quench something that is burning, such as a fire, a flame, or a spark.
Example Sentence: "The rain helped to extinguish the flames on the forest floor."
Synonyms: choke; douse; eliminate; end; eradicate; exterminate
Opposite Meaning: ignite

ex-gratia (adjective) /ˌɛks ˈɡreɪʃə/
Definition: Made out of goodwill, generosity, or sympathy rather than as a legal obligation or requirement.
Example Sentence: "He was given an ex gratia payment for his years of service."
Synonyms: complimentary; discretionary; free; goodwill; gratuitous; honorary
Opposite Meaning: obligatory

flaw (noun) /flɔ/
Definition: A defect, imperfection, or fault in something or someone.
Example Sentence: "The diamond had a small flaw that affected its clarity."
Synonyms: blemish; defect; drawback; error; fault; glitch
Opposite Meaning: perfection

floral (adjective) /ˈflɔr əl/
Definition: Relating to or characteristic of flowers.
Example Sentence: "She wore a beautiful floral dress to the garden party."
Synonyms: blooming; blossoming; botanic; flowered; flowery; gardenesque
Opposite Meaning: plain

footing (noun) /ˈfʊt ɪŋ/
Definition: The basis or foundation upon which something is established or built.
Example Sentence: "The new employee struggled to find her footing in the fast-paced work environment."
Synonyms: arrangement; balance; base; establishment; foundation; ground
Opposite Meaning: instability

gaze (verb) /geɪdʒ/
Definition: To look steadily, intently, or attentively at something or someone for an extended period.
Example Sentence: "His eyes seemed to gaze into the very depths of my soul, making me feel vulnerable."
Synonyms: eye; glance; glimpse; look; observe; ogle
Opposite Meaning: glance

gizmo (noun) /ˈgɪz moʊ/
Definition: A small, often mechanical device or gadget that has a specific function or purpose.
Example Sentence: "The kitchen gizmo made peeling potatoes a breeze."
Synonyms: apparatus; contraption; device; doodad; gadget; implement
Opposite Meaning: non-technical

glorification (noun) /ˌglɔr ə fɪˈkeɪ ʃən/
Definition: The act or process of elevating or praising someone or something to a higher status or level of admiration.
Example Sentence: "The advertising campaign relied on the glorification of luxury and exclusivity to attract customers."
Synonyms: adoration; apotheosis; elevation; exaltation; homage; idolization
Opposite Meaning: condemnation

gospel (noun) /ˈgɒs pəl/
Definition: The teachings or principles of Christianity, particularly those found in the New Testament of the Bible, specifically the life, ministry, death, and resurrection of Jesus Christ.
Example Sentence: "The pastor preached the gospel of love and compassion to his congregation."
Synonyms: belief; creed; doctrine; dogma; faith; message
Opposite Meaning: falsehood

gradient (noun) /ˈɡreɪdɪənt/
Definition: The slope or incline of a landform, such as a hill or mountain.
Example Sentence: "The bike trail had a steady gradient, making it an easy ride."
Synonyms: acclivity; ascent; bank; camber; declivity; grade
Opposite Meaning: flatness

gratuitous (adjective) /ɡrəˈtjuːɪtəs/
Definition: Unnecessary, excessive, or without reasonable justification.
Example Sentence: "He felt that the violence in the movie was gratuitous and unnecessary."
Synonyms: baseless; excessive; extraneous; groundless; inordinate; needless
Opposite Meaning: essential

hasty (adjective) /ˈheɪ sti/
Definition: Done quickly, often without proper consideration or thoughtfulness.
Example Sentence: "Samantha's hasty packing resulted in leaving behind important documents."
Synonyms: abrupt; brisk; fast; hurried; impulsive; prompt
Opposite Meaning: deliberate

heighten (verb) /ˈhaɪt n/
Definition: To intensify or increase the degree or level of something.
Example Sentence: "The suspenseful music in the movie helped to heighten the sense of anticipation."
Synonyms: accentuate; amplify; augment; boost; enhance; escalate
Opposite Meaning: diminish

hysterical (adjective) /hɪˈstɛr ɪ kəl/
Definition: Characterized by extreme and uncontrollable emotions, often including intense fear, anxiety, or excitement.
Example Sentence: "The woman's hysterical outburst during the argument made it impossible for anyone to reason with her."
Synonyms: agitated; delirious; distraught; excitable; frantic; frenzied
Opposite Meaning: calm

illuminati (noun) /ɪˌlu məˈnɑ ti/
Definition: A shadowy group believed to possess extraordinary power, knowledge, and influence over world affairs.
Example Sentence: "Some people believe that celebrities are part of the Illuminati and use their fame for hidden purposes."
Synonyms: brotherhood; cabal; clique; cult; fraternity; group
Opposite Meaning: commoner

inaccurate (adjective) /ɪnˈæk yər ɪt/
Definition: Contains errors, mistakes, or lacks precision in its representation of facts, details, or information.
Example Sentence: "The newspaper article contained several inaccurate statements about the event."
Synonyms: erroneous; fallacious; false; faulty; flawed; imprecise
Opposite Meaning: accurate

inconsistent (adjective) /ˌɪn kənˈsɪs tənt/
Definition: Lacking stability, coherence, or predictability.
Example Sentence: "Her answers during the interview were inconsistent and raised doubts about her qualifications."
Synonyms: capricious; changeable; contradictory; erratic; fickle; fluctuating
Opposite Meaning: consistent

indictment (noun) /ɪnˈdaɪt mənt/
Definition: A formal accusation or charge brought against someone for a serious offense or crime.
Example Sentence: "The indictment listed the charges, including assault, burglary, and possession of illegal substances."
Synonyms: accusation; allegation; arraignment; blame; censure; charge
Opposite Meaning: exoneration

indistinguishable (adjective) /ˌɪn dɪˈstɪŋ gwɪ ʃə bəl/
Definition: Unable to be distinguish or differentiate from something else.
Example Sentence: "The twins looked so similar that they were virtually indistinguishable from each other."
Synonyms: alike; duplicate; equal; homogeneous; identical; interchangeable
Opposite Meaning: distinguishable

inert (adjective) /ɪˈnəːt/
Definition: Lacking in energy or action, often associated with the absence of movement or change.
Example Sentence: "The organization was criticized for its inert approach to innovation."
Synonyms: impotent; inactive; listless; passive; quiescent; slack
Opposite Meaning: active

infinite (adjective) /ˈɪn fə nɪt/
Definition: Limitless, boundless, or without an end or boundary.
Example Sentence: "The starry night sky seemed to stretch into infinite darkness."
Synonyms: boundless; ceaseless; endless; eternal; everlasting; immeasurable
Opposite Meaning: finite

inflexible (adjective) /ɪnˈflɛk sə bəl/
Definition: Resistant to change, modification, or adaptation.
Example Sentence: "His inflexible personality strained his relationships as he refused to compromise or adapt."
Synonyms: adamant; immovable; intractable; intransigent; invariable; obdurate
Opposite Meaning: flexible

injurious (adjective) /ɪnˈdʒʊər i əs/
Definition: Causing harm, damage, or injury.
Example Sentence: "The company faced a lawsuit for its injurious environmental practices."
Synonyms: adverse; damaging; dangerous; deleterious; destructive; detrimental
Opposite Meaning: beneficial

insensitive (adjective) /ɪnsensɪtɪv/
Definition: Lacking empathy, tact, or consideration for the feelings and sensitivities of others.
Example Sentence: "The insensitive treatment of the patients in the healthcare facility led to a decline in trust and satisfaction."
Synonyms: apathetic; callous; heartless; inconsiderate; indifferent; tactless
Opposite Meaning: empathetic

intimate (adjective) /ˈɪntɪmət/
Definition: Closely connected, personal, or characterized by a deep sense of familiarity and emotional closeness.
Example Sentence: "The couple shared an intimate moment under the stars."
Synonyms: affectionate; cherished; confidential; convivial; cozy; dear
Opposite Meaning: distant

languor (noun) /ˈlaŋɡə/
Definition: A state of physical or mental weariness, sluggishness, or a lack of energy.
Example Sentence: "The slow, gentle rhythm of the music added to the languor of the lazy afternoon."
Synonyms: apathy; debility; fatigue; feebleness; lassitude; listlessness
Opposite Meaning: vitality

lessen (verb) /ˈlɛs ən/
Definition: To reduce or diminish the intensity, extent, quantity, or importance of something.
Example Sentence: "The medication helped lessen the severity of the symptoms."
Synonyms: abate; alleviate; curtail; decrease; diminish; ease
Opposite Meaning: increase

limit (verb) /ˈlɪm ɪt/
Definition: To impose boundaries, restrictions, or constraints on something or someone.
Example Sentence: "We need to limit our screen time to prioritize other activities."
Synonyms: bound; cap; circumscribe; confine; control; curtail
Opposite Meaning: allow

meditate (verb) /ˈmɛd ɪˌteɪt/
Definition: To engage in deep contemplation, mindfulness, and focused introspection.
Example Sentence: "The monks meditate in the temple as a part of their daily ritual."
Synonyms: brood; cogitate; consider; contemplate; deliberate; introspect
Opposite Meaning: disregard

muckraking (noun) /ˈmʌkreɪkɪŋ/
Definition: A form of investigative journalism that aims to expose corruption, scandals, and wrongdoing in society, particularly among powerful individuals or institutions.
Example Sentence: "The muckraking documentary shed light on the unethical practices of a multinational corporation."
Synonyms: disclosure; exposé; exposure; inquiry; investigation; journalism
Opposite Meaning: covering

obliging (adjective) /əˈblaɪ dʒɪŋ/
Definition: Willing and eager to help, accommodate, or assist others.
Example Sentence: "The obliging neighbor offered to water our plants while we were away."
Synonyms: accommodating; amiable; considerate; cooperative; friendly; generous
Opposite Meaning: unhelpful

observation (noun) /ˌɒb zɜrˈveɪ ʃən/
Definition: The act of carefully watching, perceiving, and taking note of one's surroundings, events, objects, or people.
Example Sentence: "The scientist made a meticulous observation of the specimen under the microscope."
Synonyms: contemplation; examination; inspection; monitoring; perception; scrutiny
Opposite Meaning: disregard

obstacle (noun) /ˈɒb stə kəl/
Definition: Something that hinders, blocks, or presents a challenge or difficulty in achieving a goal, progressing, or completing a task.
Example Sentence: "The student's determination helped him overcome academic obstacles and achieve success."
Synonyms: barrier; blockage; constraint; deterrent; difficulty; hindrance
Opposite Meaning: aid

occupant (noun) /ˈɒk yə pənt/
Definition: A person or entity who currently resides, occupies, or holds a particular position or space.
Example Sentence: "The old castle is rumored to have a ghostly occupant who roams its halls at night."
Synonyms: dweller; habitant; householder; inhabitant; inmate; lessee
Opposite Meaning: visitor

pragmatism (noun) /ˈpræg məˌtɪz əm/
Definition: A philosophical approach that emphasizes practicality, consequences, and the usefulness of ideas and actions.
Example Sentence: "Pragmatism encourages individuals to find practical solutions to everyday problems."
Synonyms: adaptability; effectiveness; empiricism; flexibility; functionality; practicality
Opposite Meaning: idealism

preoccupied (adjective) /priˈɒk yəˌpaɪd/
Definition: Being absorbed or engrossed in one's thoughts, concerns, or activities to the point of distraction or inattentiveness towards other things.
Example Sentence: "The professor was preoccupied with grading papers, often forgetting to eat or take breaks."
Synonyms: absorbed; consumed; distracted; engrossed; fixated; focused
Opposite Meaning: attentive

pronounced (adjective) /prəˈnaʊnst/
Definition: A distinct, noticeable, or conspicuous quality or characteristic of something or someone.
Example Sentence: "The fragrance had a pronounced aroma of fresh flowers."
Synonyms: clear; conspicuous; distinct; emphatic; evident; marked
Opposite Meaning: unnoticeable

providential (adjective) /ˌprɒv ɪˈdɛn ʃəl/
Definition: Influenced or guided by divine or higher power, often interpreted as an act of divine intervention or assistance.
Example Sentence: "The providential intervention of a stranger prevented a potential tragedy."
Synonyms: advantageous; auspicious; blessed; fateful; favorable; fortuitous
Opposite Meaning: unfortunate

purveyor (noun) /pərˈveɪ ər/
Definition: A person or entity that supplies, distributes, or provides goods, services, or information.
Example Sentence: "The magazine acted as a purveyor of fashion trends and beauty tips."
Synonyms: caterer; conveyor; dealer; distributor; merchant; provider
Opposite Meaning: receiver

quarters (noun) /ˈkwɔːtəz/
Definition: A designated living space or accommodations, typically used in a military or institutional setting.
Example Sentence: "The captain's quarters on the ship were spacious and well-appointed."
Synonyms: abode; accommodation; domicile; dwelling; habitation; housing
Opposite Meaning: open space

scabrous (adjective) /ˈskeɪbrəs/
Definition: Rough, harsh, or marked by coarseness, either in a literal or figurative sense.
Example Sentence: "The professor's scabrous comments about his students were reported to the university."
Synonyms: abrasive; bumpy; coarse; encrusted; jagged; knobby
Opposite Meaning: smooth

subjoin (verb) /səbˈdʒɔɪn/
Definition: To add or append something supplementary to a main or existing document, text, or statement.
Example Sentence: "The author decided to subjoin a glossary of terms to the end of the book."
Synonyms: add; affix; annex; append; attach; include
Opposite Meaning: separate

tendency (noun) /ˈtɛn dən si/
Definition: A general inclination, predisposition, or characteristic pattern of behavior exhibited by an individual or a group.
Example Sentence: "His tendency to procrastinate often led to last-minute completion of tasks."
Synonyms: bias; direction; disposition; drift; inclination; leaning
Opposite Meaning: aversion

terrace (noun) /ˈtɛr əs/
Definition: A raised, flat platform or open area that is typically attached to a building or located on the ground level of a structure.
Example Sentence: "The hotel's rooftop terrace offered breathtaking views of the city skyline."
Synonyms: balcony; courtyard; deck; lanai; patio; piazza
Opposite Meaning: valley

tessellate (verb) /ˈtɛsəleɪt/
Definition: To cover a surface with a repeated pattern of geometric shapes that fit together perfectly without any gaps or overlaps.
Example Sentence: "The puzzle pieces tessellate to form a complete picture."
Synonyms: arrange; interlock; intersperse; interweave; mesh; mosaic
Opposite Meaning: disarrange

thriving (adjective) /ˈθraɪ vɪŋ/
Definition: Great success, growth, or prosperity.
Example Sentence: "The farmer's market was a thriving hub of local produce, artisanal goods, and a vibrant atmosphere."
Synonyms: blooming; booming; burgeoning; flourishing; growing; prosperous
Opposite Meaning: failing

throwback (noun) /ˈθroʊˌbæk/
Definition: Something that is reminiscent of an earlier time, often evoking a sense of nostalgia or a return to past styles, trends, or characteristics.
Example Sentence: "The old jukebox in the corner of the diner is a charming throwback to the 1950s."
Synonyms: echo; evocation; relic; reminder; reminiscence; remnant
Opposite Meaning: modern

transitory (adjective) /ˈtrænzəˌtɔri/
Definition: Temporary or not expected to last for a long time.
Example Sentence: "The transitory nature of fame can be difficult to cope with for many celebrities."
Synonyms: brief; ephemeral; flash; fleeting; fugacious; impermanent
Opposite Meaning: permanent

truism (noun) /ˈtru ɪz əm/
Definition: A statement or belief that is widely accepted as true or self-evident.
Example Sentence: "It is a truism that honesty is the best policy when it comes to maintaining trustworthy relationships."
Synonyms: adage; aphorism; axiom; cliché; dictum; doctrine
Opposite Meaning: falsehood

unabridged (adjective) /ˌʌn əˈbrɪdʒd/
Definition: Complete and unaltered, without any omissions or reductions.
Example Sentence: "The unabridged album contained all the tracks, including bonus songs."
Synonyms: complete; comprehensive; exhaustive; full; intact; total
Opposite Meaning: shortened

unaffiliated (adjective) /ˌʌnəˈfɪlɪˌeɪtɪd/
Definition: Not being formally or officially associated or connected with a particular organization, group, or affiliation.
Example Sentence: "He decided to remain unaffiliated with any political party to maintain his independence."
Synonyms: autonomous; detached; disconnected; freestanding; independent; neutral
Opposite Meaning: allied

uninspiring (adjective) /ˌʌnɪnˈspaɪərɪŋ/
Definition: Lacking the ability to stimulate or motivate, failing to generate enthusiasm or excitement.
Example Sentence: "The uninspiring lecture failed to capture the attention of the students."
Synonyms: bland; drab; dull; lackluster; lifeless; mundane
Opposite Meaning: inspiring

waterborne (adjective) /ˈwɔ tərˌbɔrn/
Definition: Carried or transported by water.
Example Sentence: "The contaminated river posed a threat of waterborne illnesses to nearby communities."
Synonyms: aquatic; aqueous; fluvial; hydrological; lacustrine; marine
Opposite Meaning: land-based

wing (verb) /wɪŋ/
Definition: To spontaneously and confidently improvise or perform without prior preparation or planning.
Example Sentence: "He didn't have time to prepare a speech, so he decided to wing it at the conference."
Synonyms: ad-lib; extemporaneous; extempore; extemporize; freestyle; impromptu
Opposite Meaning: plan