mis·fea·sance /mɪsˈfizṇ(t)s/
  不當行為,行為失檢,過失
  Mis·fea·sance n.  Law A trespass; a wrong arising from an overt act; the improper doing of an act which a person might lawfully do.
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  misfeasance
       n : doing a proper act in a wrongful or injurious manner