Nouns

(n)deadpeople who are no longer living“they buried the dead”
(n)deada time when coldness (or some other quality associated with death) is intense“the dead of winter”

Adjectives

(a)deadno longer having or seeming to have or expecting to have life“the nerve is dead”, “a dead pallor”, “he was marked as a dead man by the assassin”
(a)deadnot showing characteristics of life especially the capacity to sustain life; no longer exerting force or having energy or heat“Mars is a dead planet”, “dead soil”, “dead coals”, “the fire is dead”
(s)all in, beat, bushed, deadvery tired“was all in at the end of the day”, “so beat I could flop down and go to sleep anywhere”, “bushed after all that exercise”, “I'm dead after that long trip”
(s)deadunerringly accurate“a dead shot”, “took dead aim”
(s)deadphysically inactive“Crater Lake is in the crater of a dead volcano of the Cascade Range”
(s)dead, numb(followed by ‘to’) not showing human feeling or sensitivity; unresponsive“passersby were dead to our plea for help”, “numb to the cries for mercy”
(s)dead, deadeneddevoid of physical sensation; numb“his gums were dead from the novocain”, “she felt no discomfort as the dentist drilled her deadened tooth”, “a public desensitized by continuous television coverage of atrocities”
(s)deadlacking acoustic resonance“dead sounds characteristic of some compact discs”, “the dead wall surfaces of a recording studio”
(s)dead, idlenot yielding a return“dead capital”, “idle funds”
(s)dead, stagnantnot circulating or flowing“dead air”, “dead water”, “stagnant water”
(s)deadnot surviving in active use“Latin is a dead language”
(s)deadlacking resilience or bounce“a dead tennis ball”
(s)deadout of use or operation because of a fault or breakdown“a dead telephone line”, “the motor is dead”
(s)deadno longer having force or relevance“a dead issue”
(s)deadthe complete stoppage of an action“came to a dead stop”
(s)dead, draineddrained of electric charge; discharged“a dead battery”, “left the lights on and came back to find the battery drained”
(s)deaddevoid of activity“this is a dead town: nothing ever happens here”

Adverbs

(r)absolutely, perfectly, utterly, deadcompletely and without qualification; used informally as intensifiers“an absolutely magnificent painting”, “a perfectly idiotic idea”, “you're perfectly right”, “utterly miserable”, “you can be dead sure of my innocence”, “was dead tired”, “dead right”
(r)suddenly, all of a sudden, on the spur of the moment, of a sudden, abruptly, dead, shortquickly and without warning“he stopped suddenly”, “suddenly she felt a sharp pain in her side”, “he decided to go to Chicago on the spur of the moment”, “he made up his mind suddenly”