| dead | (adjective) no longer having or seeming to have or expecting to have life | - |
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| (adjective) not showing characteristics of life especially the capacity to sustain life; no longer exerting force or having energy or heat | - |
| (adjective) the complete stoppage of an action | - |
| (adjective) not surviving in active use | - |
| (adjective) physically inactive | - |
| (adjective) devoid of activity | - |
| (adjective) lacking resilience or bounce | - |
| (adjective) out of use or operation because of a fault or breakdown | - |
| (adjective) devoid of physical sensation; numb | Synonyms: deadened |
| (adjective) (followed by `to') not showing human feeling or sensitivity; unresponsive | Synonyms: numb |
| (adjective) no longer having force or relevance | - |
| (adjective) unerringly accurate | - |
| (adjective) not circulating or flowing | Synonyms: stagnant |
| (adjective) very tired | Synonyms: all in, beat, bushed |
| (adjective) drained of electric charge; discharged | Synonyms: drained |
| (adjective) not yielding a return | Synonyms: idle |
| (adjective) lacking acoustic resonance | - |
| (noun) people who are no longer living | - |
| (noun) a time when coldness (or some other quality associated with death) is intense | - |
| (adverb) completely and without qualification; used informally as intensifiers | Synonyms: absolutely, perfectly, utterly |
| (adverb) quickly and without warning; happening unexpectedly; on impulse; without premeditation | Synonyms: abruptly, all of a sudden, of a sudden, on the spur of the moment, short, suddenly |
| deadbeat | (noun) someone who fails to meet a financial obligation | Synonyms: defaulter |
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| deadbolt | (noun) the part of a lock that is engaged or withdrawn with a key | Synonyms: bolt |
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| deaden | (verb) become lifeless, less lively, intense, or active; lose life, force, or vigor | - |
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| (verb) make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation | Synonyms: blunt |
| (verb) lessen the momentum or velocity of | - |
| (verb) make vapid or deprive of spirit | - |
| (verb) convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil | - |
| (verb) make vague or obscure or make (an image) less visible | Synonyms: damp, dampen |
| (verb) cut a girdle around so as to kill by interrupting the circulation of water and nutrients | Synonyms: girdle |
| deadened | (adjective) made or become less intense | - |
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| (adjective) devoid of physical sensation; numb | Synonyms: dead |
| deadening | (adjective) so lacking in interest as to cause mental weariness | Synonyms: boring, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome |
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| (noun) the act of making something futile and useless (as by routine) | Synonyms: constipation, impairment, stultification |
| deadeye | (noun) (nautical) a round hardwood disk with holes and a grooved perimeter used to tighten a shroud | - |
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| (noun) a dead shot | - |
| deadhead | (noun) a train or bus or taxi traveling empty | - |
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| (noun) a nonenterprising person who is not paying his way | - |
| deadlift | (noun) a weight training exercise in which a loaded barbell is lifted off the ground to the hips, then lowered back to the ground | - |
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| deadlight | (noun) a strong shutter over a ship's porthole that is closed in stormy weather | - |
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| deadline | (noun) the point in time at which something must be completed | - |
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| deadliness | (noun) the quality of being deadly | Synonyms: lethality |
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| deadlock | (noun) a situation in which no progress can be made or no advancement is possible | Synonyms: dead end, impasse, stalemate, standstill |
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| deadlocked | (adjective) at a complete standstill because of opposition of two unrelenting forces or factions | Synonyms: stalemated |
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| deadly | (adjective) exceedingly harmful | Synonyms: baneful, pernicious, pestilent |
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| (adjective) extremely poisonous or injurious; producing venom | Synonyms: venomous, virulent |
| (adjective) involving loss of divine grace or spiritual death | Synonyms: mortal |
| (adjective) (of a disease) having a rapid course and violent effect | - |
| (adjective) causing or capable of causing death | Synonyms: deathly, mortal |
| (adjective) of an instrument of certain death | Synonyms: lethal |
| (adverb) (used as intensives) excessively | Synonyms: deucedly, devilishly, insanely, madly |
| (adverb) as if dead | Synonyms: lifelessly |
| deadness | (noun) the inanimate property of something that has died | - |
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| (noun) the physical property of something that has lost its elasticity | - |
| (noun) the quality of being unresponsive; not reacting; as a quality of people, it is marked by a failure to respond quickly or with emotion to people or events | Synonyms: unresponsiveness |
| deadpan | (adjective) deliberately impassive in manner | Synonyms: expressionless, impassive, poker-faced, unexpressive |
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| (adverb) without betraying any feeling | - |
| deadwood | (noun) someone or something that is unwanted and unneeded | Synonyms: fifth wheel |
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| (noun) a branch or a part of a tree that is dead | - |