Breadcrumb Home > Thesaurus > L Synonyms of lunacy Find synonyms for: Noun 1. lunacy, madness, insaneness, insanity usage: obsolete terms for legal insanity 2. folly, foolery, tomfoolery, craziness, lunacy, indulgence, play, frolic, romp, gambol, caper usage: foolish or senseless behavior WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of lunacy (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: debridement Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language