Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun lunacy

2 senses of lunacy

Sense 1
lunacy, madness, insaneness -- (obsolete terms for legal insanity)
       => insanity -- (relatively permanent disorder of the mind)

Sense 2
folly, foolery, tomfoolery, craziness, lunacy, indulgence -- (foolish or senseless behavior)
       => play, frolic, romp, gambol, caper -- (gay or light-hearted recreational activity for diversion or amusement; "it was all done in play"; "their frolic in the surf threatened to become ugly")