1. (n.) The disbelief or denial of the existence of a God\, or supreme intelligent Being.

2. (n.) Godlessness.

agnosticism apostasy backsliding denial desertion disbelief discredit faithlessness fall from grace gentilism heresy impiety impiousness inability to believe incredulity infidelity irreligion irreverence lapse lapse from grace minimifidianism misbelief nonbelief nullifidianism recidivism recreancy rejection secularism unbelief unbelievingness undutifulness