资料来源 : Webster's Revised Unabridged Dictionary (1913)

Disbeliever \Dis`be*liev"er\, n.
   One who disbelieves, or refuses belief; an unbeliever.
   Specifically, one who does not believe the Christian
   religion. --I. Watts.

资料来源 : WordNet®

disbeliever
     n : someone who refuses to believe (as in a divinity) [syn: {nonbeliever},
          {unbeliever}]