| 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 | - |
| 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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| 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 |
| deadpan | (adjective) deliberately impassive in manner | Synonyms: expressionless, impassive, poker-faced, unexpressive |
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