Definition of "Crazy" :

noun: someone deranged and possibly dangerous

adjective: intensely enthusiastic about or preoccupied with

"Crazy about cars and racing."

adjective: possessed by inordinate excitement

"The crowd went crazy."

adjective: bizarre or fantastic

"Had a crazy dream."

adjective: foolish; totally unsound

"A crazy scheme."

adjective: affected with madness or insanity