DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   insane
       adj 1: afflicted with or characteristic of mental derangement;
              "was declared insane"; "insane laughter" [ant: sane]
       2: very foolish; "harebrained ideas"; "took insane risks behind
          the wheel"; "a completely mad scheme to build a bridge
          between two mountains" [syn: harebrained, insane, mad]