- (figuratively, humorous) comparative form of dead: more dead; or at least more evidently dead.
"He was deader than a dead dog's bone buried down a blind alley off a dead-end street in a ghost town. Man, he was dead."
- (figurative or humorous, informal) One who is deceased, or will shortly become so.
"I could tell he was a deader by the way his eyes were glazed over; there was no life left in those eyes."