improper - definition and synonyms

adjective 

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/ɪmˈprɒpə(r)/
  1. 1
    not suitable or right according to accepted standards of social or professional behaviour

    It would have been highly improper for you to accept the money.

    1. a.
      used about things that people find embarrassing or offensive because they involve sex

      He had made improper suggestions to her.

  2. 2
    not legal or honest

    The Court judged that there had been no improper conduct by the club.

  3. 3
    not correct according to the rules

derived word