Source : Webster's Revised Unabridged Dictionary (1913)

Misdemean \Mis`de*mean"\, v. t.
   To behave ill; -- with a reflexive pronoun; as, to misdemean
   one's self.

Source : WordNet®

misdemean
     v : behave badly; "The children misbehaved all morning" [syn: {misbehave},
          {misconduct}] [ant: {behave}]