lunacy luna • lunambulism · · · Info · Definitions · Synonyms · Characters · · lunacy · · Text Latin · · Script 6 · · Length Definitions · · · (noun) obsolete terms for legal insanity. Synonyms: madness, insaneness. · · Noun Definition 1 (noun) foolish or senseless behavior. Synonyms: folly, foolery, tomfoolery, craziness, indulgence. · · Noun Definition 2 Synonyms · · · madness · · Synonym 1 insaneness · · Synonym 2 folly · · Synonym 3 foolery · · Synonym 4 tomfoolery · · Synonym 5 craziness · · Synonym 6 indulgence · · Synonym 7 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 l latin small letter l U+006C n latin small letter n U+006E u latin small letter u U+0075 y latin small letter y U+0079