WordWeb Online

1. [informal] Relatively permanent disorder of the mind
   - insanity, madness
    
2. The quality of being rash and foolish
   "trying to drive through a blizzard is the height of craziness";
   - folly, foolishness, madness, nuttiness [informal], insanity
    
3. Foolish or senseless behaviour
   - folly, foolery, tomfoolery, lunacy, indulgence

Type of: caper [informal], daftness [informal], frolic, gambol, mental disease, mental illness, play, psychopathy, romp, stupidity

Encyclopedia: Craziness