| 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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| indefeasible | (adjective) not liable to being annulled or voided or undone | - |
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| indefensible | (adjective) incapable of being justified or explained | Synonyms: insupportable, unjustifiable, unwarrantable, unwarranted |
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| (adjective) (of theories etc) incapable of being defended or justified | Synonyms: untenable |
| (adjective) not able to be protected against attack | - |
| undefeated | (adjective) victorious | - |
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| undefendable | (adjective) not defended or capable of being defended | Synonyms: assailable, open, undefended |
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| undefended | (adjective) not defended or capable of being defended | Synonyms: assailable, open, undefendable |
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| undeferential | (adjective) not showing courteous respect | - |
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