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Adjective: cantankerous  kan'tang-ku-rus
  1. Stubbornly obstructive and unwilling to cooperate
    "unions...have never been as cantankerous about demarcation as the shipbuilders";
    - bloody-minded [Brit]
  2. Having a difficult and contrary disposition
    "a cantankerous and venomous-tongued old lady";
    - crotchety, ornery [N. Amer]

See also: ill-natured, obstinate, stubborn, unregenerate

Encyclopedia: Cantankerous