The Collaborative International Dictionary of English v.0.48:

Misconduct \Mis*con"duct\, n.
   1. Wrong conduct; bad behavior; mismanagement. --Addison.
      [1913 Webster]

   2. Unlawful or unethical conduct by a person holding a public
      office or having a position of responsibility in the
      administration of justice; malfeasance; as, discussing the
      case out of court during a trial is misconduct by a juror;
      especially, misuse of office by an elected or appointed
      government official, also called misconduct in office.
      [PJC]

   Syn: Misbehavior; misdemeanor; mismanagement; misdeed;
        delinquency; offense.
        [1913 Webster]