The Collaborative International Dictionary of English v.0.48:

Misconduct \Mis`con*duct"\, v. i.
   To behave amiss.
   [1913 Webster]

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]

The Collaborative International Dictionary of English v.0.48:

Misconduct \Mis`con*duct"\, v. t.
   To conduct amiss; to mismanage. --Johnson.
   [1913 Webster]

   To misconduct one's self, to behave improperly.
      [1913 Webster]

WordNet (r) 3.0 (2006):

misconduct
    n 1: bad or dishonest management by persons supposed to act on
         another's behalf
    2: activity that transgresses moral or civil law; "he denied any
       wrongdoing" [syn: wrongdoing, wrongful conduct,
       misconduct, actus reus]
    v 1: behave badly; "The children misbehaved all morning" [syn:
         misbehave, misconduct, misdemean] [ant: behave,
         comport]
    2: manage badly or incompetently; "The funds were mismanaged"
       [syn: mismanage, mishandle, misconduct]