no longer alive

a dead body

he has been dead for many years

he was shot dead by a sniper

there was no time to bury the dead with decency

(of a place or time) characterized by a lack of activity or excitement

Brussels isn't dead after dark, if you know where to look

(of a piece of equipment) no longer functioning

the phone had gone dead

no longer current, relevant, or important

pollution had become a dead issue

(of sound) without resonance; dull

the note sounds dead compared to all others on the keyboard

complete; absolute

we sat in dead silence

absolutely; completely

you're dead right

he was dead against the idea