crazy in WordNet English dictionary

1. affected with madness or insanity
   "a man who had gone mad"
   brainsick  crazy  demented  disturbed  mad  sick  unbalanced  unhinged 
   
2. intensely enthusiastic about or preoccupied with
   "crazy about cars and racing"; "he is potty about her"
   crazy  wild  dotty  gaga 
   
3. possessed by inordinate excitement
   "the crowd went crazy"; "was crazy to try his new bicycle"
   crazy 
   
4. foolish; totally unsound
   "a crazy scheme"; "half-baked ideas"; "a screwball proposal without a prayer of working"
   crazy  half-baked  screwball  softheaded 
   
5. bizarre or fantastic
   "had a crazy dream"; "wore a crazy hat"
   crazy 
   

1. someone deranged and possibly dangerous
   crazy  loony  looney  nutcase  weirdo