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Adjective: unwarrantable  ,ún'wor-un-tu-bul or ,ún'wó-run-tu-bul [N. Amer], ,ún'wó-rin-tu-bul [Brit]
  1. Incapable of being justified or explained
    "His unwarrantable behaviour at the meeting shocked everyone";
    - indefensible, insupportable, unjustifiable, unwarranted

See also: inexcusable