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]

Moby Thesaurus II by Grady Ward, 1.0:

106 Moby Thesaurus words for "misconduct":
   abuse, abuse of office, bad policy, badness, be negligent,
   befoulment, conversion, corrupt administration, crime,
   criminal tendency, criminality, criminosis, debasement,
   defalcation, defilement, desecration, discourtesy, disorder,
   disorderliness, disorderly conduct, disruption, disruptiveness,
   diversion, do amiss, embezzlement, evil courses, evildoing,
   feloniousness, fouling, frowned-upon behavior, hooliganism,
   horseplay, impolicy, impropriety, inexpedience, inexpediency,
   lawbreaking, maladminister, maladministration, malfeasance,
   malpractice, malversation, misadminister, misadministration,
   misapplication, misapply, misappropriation, misbehavior, miscall,
   miscite, miscount, misdeal, misdemeanor, misdirect, misdirection,
   misdoing, misemploy, misemployment, misfeasance, misfield,
   misgovern, misgovernment, misguidance, misguide, mishandle,
   mishandling, mismanage, mismanagement, misplay, misprint,
   misprision, misprision of treason, misquote, misread, misreport,
   misrule, misspell, misusage, misuse, naughtiness, neglect,
   negligence, nonfeasance, nonsanctioned behavior, omission,
   peculation, perversion, pilfering, pollution, poor stewardship,
   positive misprision, profanation, prostitution, roughhouse,
   rowdiness, rowdyism, ruffianism, sin, thou scarlet sin, vandalism,
   venial sin, vice, viciousness, violation, wrong conduct,
   wrongdoing