'Unbeliever' definitions:

Definition of 'unbeliever'

From: WordNet
noun
Someone who refuses to believe (as in a divinity) [syn: disbeliever, nonbeliever, unbeliever]

Definition of 'Unbeliever'

From: GCIDE
  • Unbeliever \Un`be*liev"er\, n.
  • 1. One who does not believe; an incredulous person; a doubter; a skeptic. [1913 Webster]
  • 2. 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. [1913 Webster]
  • Syn: See Infidel. [1913 Webster]