· someone deranged and possibly dangerous
Synonym(s): loony, looney, nutcase, weirdo
Hypernym(s): lunatic, madman, maniac
· affected with madness or insanity; "a man who had gone mad"
Synonym(s): brainsick, demented, disturbed, mad, sick, unbalanced, unhinged
· foolish; totally unsound; "a crazy scheme"; "half-baked ideas"; "a screwball proposal without a prayer of working"
Synonym(s): half-baked, screwball, softheaded
· possessed by inordinate excitement; "the crowd went crazy"; "was crazy to try his new bicycle"
· bizarre or fantastic; "had a crazy dream"; "wore a crazy hat"
· intensely enthusiastic about or preoccupied with; "crazy about cars and racing"; "they are dotty about each other"; "gaga over the rock group's new album"