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Adjective: tactless  takt-lus
  1. Lacking or showing a lack of what is fitting and considerate in dealing with others
    "in the circumstances it was tactless to ask her age";
    - untactful
  2. Revealing lack of perceptiveness, judgment or finesse
    "it was tactless to bring up those disagreeable";
    - inept

See also: inconsiderate, inelegant, maladroit

Antonym: tactful