| oppa | (noun) a male who is older than the speaker, especially used by Korean female | - |
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| opponent | (noun) someone who offers opposition | Synonyms: adversary, antagonist, opposer, resister |
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| (noun) a contestant that you are matched against | Synonyms: opposite, opposition |
| 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 | (noun) a person who places expediency above principle | Synonyms: self-seeker |
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| opportunity | (noun) a possibility due to a favorable combination of circumstances | Synonyms: chance |
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| opposer | (noun) someone who offers opposition | Synonyms: adversary, antagonist, opponent, resister |
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| opposite | (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 |
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| (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 |
| 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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| 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: | - |
| 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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| opprobrium | (noun) a state of extreme dishonor | Synonyms: infamy |
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| (noun) state of disgrace resulting from public abuse | Synonyms: obloquy |