30 Moby Thesaurus words for "crazy idea": absurd idea, boutade, brainstorm, capriccio, caprice, conceit, crank, craze, crotchet, fad, fancy, fantastic notion, fantasy, flimflam, fool notion, freak, freakish inspiration, harebrained idea, humor, kink, maggot, megrim, notion, passing fancy, quirk, toy, vagary, whim, whim-wham, whimsy