devoid of activity
“this is a dead town; nothing ever happens here”
lacking acoustic resonance
“dead sounds characteristic of some compact discs”
lacking resilience or bounce
“a dead tennis ball”
no longer having force or relevance
“a dead issue”
no longer having or seeming to have or expecting to have life
“the nerve is dead”
not showing characteristics of life especially the capacity to sustain life; no longer exerting force or having energy or heat
“Mars is a dead planet”
not surviving in active use
“Latin is a dead language”
out of use or operation because of a fault or breakdown
“a dead telephone line”
people who are no longer living
“they buried the dead”
physically inactive
“Crater Lake is in the crater of a dead volcano of the Cascade Range”
not showing human feeling or sensitivity; unresponsive
“passersby were dead to our plea for help”