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Adjective: indefensible  ,in-du'fen-su-bul
  1. (of theories etc) incapable of being defended or justified
    "One can put oneself into a false position, ultimately into an indefensible position";
    - untenable
  2. Not able to be protected against attack
  3. Incapable of being justified or explained
    "Such sanctions are utterly indefensible";
    - insupportable, unjustifiable, unwarrantable, unwarranted

See also: inexcusable, unreasonable, vulnerable

Encyclopedia: Indefensible