The Collaborative International Dictionary of English v.0.48:
Irreligiousness \Ir`re*li"gious*ness\, n. The state or quality of being irreligious; ungodliness. [1913 Webster]WordNet (r) 3.0 (2006):
irreligiousness n 1: the quality of not being devout [syn: irreligiousness, irreligion]