The loss or abandonment of a belief; cessation of belief.
Astonishment.
Unpreparedness, unwillingness, or inability to believe that something is the case.
Lack of religious belief.
Unfaithfulness in some other moral obligation.
Unfaithfulness in a marriage or an intimate relationship: practice or instance of having a sexual or romantic affair with someone other than one's spouse, without the consent of the spouse.