Adjective
1. affected with madness or insanity;
"a man who had gone mad"2. foolish; totally unsound;
"an impractical solution""a crazy scheme""half-baked ideas""a screwball proposal without a prayer of working"3. 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. possessed by inordinate excitement;
"the crowd went crazy""was crazy to try his new bicycle"5. bizarre or fantastic;
"had a crazy dream""wore a crazy hat"6. intensely enthusiastic about or preoccupied with;
"crazy about cars and racing"