The Collaborative International Dictionary of English v.0.48:
Godless \God"less\, a. Having, or acknowledging, no God; without reverence for God; impious; wicked. -- God"less*ly, adv. -- God"less*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
godless adj 1: not revering god [syn: godless, irreverent]