1. (n.) The withholding of belief; doubt; incredulity; skepticism\.

2. (n.) Disbelief; especially, disbelief of divine revelation, or in a divine providence or scheme of redemption.

apprehension atheism disbelief distrust doubt dubiety faithlessness gentilism incredulity infidelity minimifidianism misgiving mistrust nullifidianism qualm secularism skepticism suspicion unbelievingness uncertainty unfaith