mal·fea·sance /ˌmælˈfizṇ(t)s/
  不正當,不法行為,壞事,瀆職
  Mal·fea·sance n.  Law The doing of an act which a person ought not to do; evil conduct; an illegal deed. [Written also malefeasance.]
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  malfeasance
       n : wrongful conduct by a public official