Synonyms for dead

adjective

• devoid of physical sensation; numb
• (followed by `to') not showing human feeling or sensitivity; unresponsive
• very tired
• drained of electric charge; discharged
• not circulating or flowing
• not yielding a return
• devoid of activity
• lacking acoustic resonance
• lacking resilience or bounce
• no longer having force or relevance
• no longer having or seeming to have or expecting to have life
• not showing characteristics of life especially the capacity to sustain life; no longer exerting force or having energy or heat
• not surviving in active use
• out of use or operation because of a fault or breakdown
• physically inactive
• the complete stoppage of an action
• unerringly accurate

adverb

• quickly and without warning
• completely and without qualification; used informally as intensifiers

noun

• a time when coldness (or some other quality associated with death) is intense
• people who are no longer living