- craziness, daftness, flakiness - informal terms for insanity
--1 is a kind of insanity
- folly, foolishness, craziness - the quality of being rash and foolish
--2 is a kind of stupidity
- folly, foolery, tomfoolery, craziness, lunacy, indulgence - foolish or senseless behavior
--3 is a kind of play, frolic, romp, gambol, caper
--3 has particulars:meshugaas, mishegaas, mishegoss; buffoonery, clowning, frivolity, harlequinade, prank