1. Affected with madness or insanity
   "a man who had gone crazy";
   - brainsick [archaic], demented, disturbed, mad, unbalanced, unhinged
    
2. Foolish; totally unsound
   "That's a crazy idea";
   - half-baked [informal], screwball [informal], softheaded, crackpot [informal], moronic [informal], nutty [informal], wiggy [US, informal]
    
3. Possessed by inordinate excitement
   "the crowd went crazy"; "was crazy to try his new bicycle"
    
4. Intensely enthusiastic about or preoccupied with
   "crazy about cars and racing";
   - wild [informal], dotty [Brit, informal], gaga [informal]
    
5. Bizarre or fantastic
   "had a crazy dream"; "wore a crazy hat"

1. An insane person
   "The homeless crazy muttered to himself as he wandered the streets";
   - lunatic, maniac, loony [informal], looney [informal], nutcase [informal], headcase [informal]

Derived forms: crazier, craziest, crazies

See also: absurd, cockeyed [informal], derisible, derisory, enthusiastic, excited, idiotic, impractical, insane, keen, laughable, ludicrous, nonsensical, oddball, preposterous, ridic [informal], ridiculous, strange, unusual

Type of: diseased person, sick person, sufferer

Encyclopedia: Crazy, Sick & Cracked