| defamatory | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, calumnious, denigrating, denigrative, denigratory, libellous, libelous, slanderous |
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| 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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| defiant | (adjective) boldly resisting authority or an opposing force | Synonyms: noncompliant |
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| deficient | (adjective) of a quantity not able to fulfill a need or requirement | Synonyms: insufficient |
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| (adjective) inadequate in amount or degree | Synonyms: lacking, wanting |
| (adjective) falling short of some prescribed norm | Synonyms: inferior, substandard |
| defiled | (adjective) morally blemished; stained or impure | Synonyms: maculate |
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| definable | (adjective) capable of being defined, limited, or explained | - |
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| defined | (adjective) clearly characterized or delimited | - |
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| (adjective) showing clearly the outline or profile or boundary | Synonyms: outlined |
| definite | (adjective) precise; explicit and clearly defined | - |
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| (adjective) known for certain | - |
| definitive | (adjective) supplying or being a final or conclusive settlement | Synonyms: determinate |
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| (adjective) clearly defined or formulated | Synonyms: unequivocal |
| (adjective) of recognized authority or excellence | Synonyms: authoritative |
| deflated | (adjective) brought low in spirit | Synonyms: chapfallen, chopfallen, crestfallen |
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| deflationary | (adjective) associated with or tending to cause decreases in consumer prices or increases in the purchasing power of money | - |
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| deflective | (adjective) capable of changing the direction (of a light or sound wave) | Synonyms: refractive |
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| defoliate | (adjective) deprived of leaves | Synonyms: defoliated |
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| defoliated | (adjective) deprived of leaves | Synonyms: defoliate |
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| deformational | (adjective) relating to or causing change in either shape or size of a material body or geometric figure | - |
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| deformed | (adjective) so badly formed or out of shape as to be ugly | Synonyms: distorted, ill-shapen, malformed, misshapen |
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| deft | (adjective) skillful in physical movements; especially of the hands | Synonyms: dexterous, dextrous |
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| defunct | (adjective) having ceased to exist or live | - |
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| (adjective) no longer in force or use; inactive | - |