| oppa | (noun) a male who is older than the speaker, especially used by Korean female | - |
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| opponent | (adjective) characterized by active hostility | Synonyms: opposing |
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| (noun) someone who offers opposition | Synonyms: adversary, antagonist, opposer, resister |
| (noun) a contestant that you are matched against | Synonyms: opposite, opposition |
| opportune | (adjective) suitable or at a time that is suitable or advantageous especially for a particular purpose | - |
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| opportunely | (adverb) conveniently | - |
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| opportuneness | (noun) timely convenience | Synonyms: patness, timeliness |
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| opportunism | (noun) taking advantage of opportunities without regard for the consequences for others | Synonyms: expedience, self-interest, self-seeking |
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| opportunist | (adjective) taking immediate advantage, often unethically, of any circumstance of possible benefit | Synonyms: opportunistic, timeserving |
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| (noun) a person who places expediency above principle | Synonyms: self-seeker |
| opportunistic | (adjective) taking immediate advantage, often unethically, of any circumstance of possible benefit | Synonyms: opportunist, timeserving |
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| opportunity | (noun) a possibility due to a favorable combination of circumstances | Synonyms: chance |
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| opposable | (adjective) capable of being placed opposite to something | Synonyms: apposable |
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| oppose | (verb) be resistant to | Synonyms: contradict, controvert |
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| (verb) be against; express opposition to | - |
| (verb) set into opposition or rivalry | Synonyms: match, pit, play off |
| (verb) fight against or resist strongly | Synonyms: defend, fight, fight back, fight down |
| (verb) act against or in opposition to | Synonyms: react |
| (verb) contrast with equal weight or force | Synonyms: counterbalance |
| opposed | (adjective) being in opposition or having an opponent | - |
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| opposer | (noun) someone who offers opposition | Synonyms: adversary, antagonist, opponent, resister |
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| opposing | (adjective) characterized by active hostility | Synonyms: opponent |
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| opposite | (adjective) of leaves etc; growing in pairs on either side of a stem | Synonyms: paired |
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| (adjective) characterized by opposite extremes; completely opposed | Synonyms: diametric, diametrical, polar |
| (adjective) the other one of a complementary pair | - |
| (adjective) being directly across from each other; facing | - |
| (adjective) altogether different in nature or quality or significance | - |
| (adjective) moving or facing away from each other | - |
| (noun) a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other | Synonyms: antonym, opposite word |
| (noun) a contestant that you are matched against | Synonyms: opponent, opposition |
| (noun) a relation of direct opposition | Synonyms: contrary, reverse |
| (noun) something inverted in sequence or character or effect | Synonyms: inverse |
| (adverb) directly facing each other | Synonyms: face-to-face, face to face |
| oppositely | (adverb) in an opposite position | - |
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| oppositeness | (noun) the relation between opposed entities | Synonyms: opposition |
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| opposition | (noun) the act of hostile groups opposing each other | Synonyms: confrontation |
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| (noun) the action of opposing something that you disapprove or disagree with | Synonyms: resistance |
| (noun) a body of people united in opposing something | - |
| (noun) an armed adversary (especially a member of an opposing military force) | Synonyms: enemy, foe, foeman |
| (noun) a contestant that you are matched against | Synonyms: opponent, opposite |
| (noun) a direction opposite to another | - |
| (noun) the relation between opposed entities | Synonyms: oppositeness |
| oppositionality | (noun) The quality of opposing or of being in conflict. | - |
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| oppositive | (adjective) expressing antithesis or opposition | Synonyms: adversative |
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| oppress | (verb) come down on or keep down by unjust use of one's authority | Synonyms: crush, suppress |
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| (verb) cause to suffer | Synonyms: persecute |
| oppressed | (adjective) burdened psychologically or mentally | Synonyms: laden |
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| oppression | (noun) the act of subjugating by cruelty | Synonyms: subjugation |
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| (noun) a feeling of being oppressed | Synonyms: oppressiveness |
| (noun) the state of being kept down by unjust use of force or authority: | - |
| oppressive | (adjective) marked by unjust severity or arbitrary behavior | Synonyms: tyrannical, tyrannous |
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| (adjective) weighing heavily on the senses or spirit | - |
| oppressively | (adverb) in a heavy and oppressive way | - |
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| oppressiveness | (noun) unwelcome burdensome difficulty | Synonyms: burdensomeness, heaviness, onerousness |
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| (noun) a feeling of being oppressed | Synonyms: oppression |
| oppressor | (noun) a person of authority who subjects others to undue pressures | - |
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| opprobrious | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, ignominious, inglorious, shameful |
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| (adjective) expressing offensive reproach | Synonyms: abusive, scurrilous |
| opprobrium | (noun) a state of extreme dishonor | Synonyms: infamy |
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| (noun) state of disgrace resulting from public abuse | Synonyms: obloquy |
| oppugn | (verb) challenge the accuracy, probity, or propriety of | Synonyms: call into question, question |
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