/ Thesaurus / I Synonyms of insaneness Find synonyms for: Noun1. lunacy, madness, insaneness, insanityusage: obsolete terms for legal insanityWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language