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Adjective: unseemly (unseemlier,unseemliest)  ,ún'seem-lee
  1. Not in keeping with accepted standards of what is right or proper in polite society
    "unseemly to use profanity";
    - indecent, indecorous, unbecoming, uncomely, untoward

Derived forms: unseemliest, unseemlier

See also: improper