Webster's English Dictionary

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unbelief

un.be.lief \.*n-b*-'le-f\ n : incredulity or skepticism esp. in matters of 
   religious faith of belief esp. but not always in religion or divine 
   revelation; DISBELIEF stresses a positive rejection of what is asserted or 
   stated; INCREDULITY suggests a disposition to refuse belief or acceptance 
   SYN syn DISBELIEF, INCREDULITY: UNBELIEF stresses absence