Definitions for unbelieverˌʌn bɪˈli vər
Random House Webster's College Dictionary
un•be•liev•erˌʌn bɪˈli vər(n.)
a person who does not believe.
Ref: nonbeliever .
Origin of unbeliever:
disbeliever, nonbeliever, unbeliever(noun)
someone who refuses to believe (as in a divinity)
One who does not believe, particularly in a deity (used by believers to describe other people)
one who does not believe; an incredulous person; a doubter; a skeptic
a disbeliever; especially, one who does not believe that the Bible is a divine revelation, and holds that Christ was neither a divine nor a supernatural person; an infidel; a freethinker