deader

Etymology
or

Adjective

 * 1)  ; 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. 

Noun

 * 1)  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. 

Etymology
From.

Verb

 * 1)  to succeed (in doing something well, "killing it")

Usage notes
Only used as infinitive or non-standard written past participle as dead.