| defeasible | (adjective) capable of being annulled or voided or terminated | - |
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| defeated | (adjective) beaten or overcome; not victorious | - |
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| (adjective) disappointingly unsuccessful | Synonyms: disappointed, discomfited, foiled, frustrated, thwarted |
| defective | (adjective) markedly subnormal in structure or function or intelligence or behavior | - |
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| (adjective) having a defect | Synonyms: faulty |
| (adjective) not working properly | Synonyms: bad |
| defenceless | (adjective) lacking weapons for self-defense | Synonyms: defenseless |
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| (adjective) lacking protection or support | Synonyms: defenseless |
| defendable | (adjective) capable of being defended | Synonyms: defensible |
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| defending | (adjective) attempting to or designed to prevent an opponent from winning or scoring | - |
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| defenseless | (adjective) lacking weapons for self-defense | Synonyms: defenceless |
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| (adjective) having no protecting or concealing cover | Synonyms: naked |
| (adjective) lacking protection or support | Synonyms: defenceless |
| defensible | (adjective) capable of being defended | Synonyms: defendable |
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| defensive | (adjective) intended or appropriate for defending against or deterring aggression or attack | - |
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| (adjective) attempting to justify or defend in speech or writing | Synonyms: justificative, justificatory |
| deferent | (adjective) showing deference | Synonyms: deferential, regardful |
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| deferential | (adjective) showing deference | Synonyms: deferent, regardful |
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| defervescent | (adjective) of or relating to the reduction of a fever | - |
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