/ Thesaurus / I Synonyms of irreligiousness Find synonyms for: Noun1. irreligiousness, irreligion, impiety, impiousnessusage: the quality of not being devoutWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language