The adj crazy has 6 senses (first 4 from tagged texts)
1. (10) brainsick, crazy, demented, distracted, disturbed, mad, sick, unbalanced, unhinged -- (affected with madness or insanity; "a man who had gone mad")
2. (2) crazy, half-baked, screwball, softheaded -- (foolish; totally unsound; "a crazy scheme"; "half-baked ideas"; "a screwball proposal without a prayer of working")
3. (2) crazy, dotty, gaga, enamored, infatuated, in love, smitten, soft on, taken with -- (marked by foolish or unreasoning fondness; "she was crazy about him"; "gaga over the rock group's new album"; "he was infatuated with her")
4. (1) crazy -- (possessed by inordinate excitement; "the crowd went crazy"; "was crazy to try his new bicycle")
5. crazy -- (bizarre or fantastic; "had a crazy dream"; "wore a crazy hat")
6. crazy, wild -- (intensely enthusiastic about or preoccupied with; "crazy about cars and racing")