Synonyms for lunacy Found 7 synonyms across 2 meanings for “lunacy”. obsolete terms for legal insanity (noun) madnessinsaneness foolish or senseless behavior (noun) follyfoolerytomfoolerycrazinessindulgence Explore Related Words Rhymes with lunacySynonyms for madnessSynonyms for insanenessSynonyms for follySynonyms for foolerySynonyms for tomfoolery Synonym Finder | Rhyme Finder | Poetry Editor