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Adjective: fractious  frak-shus
  1. Stubbornly resistant to authority or control
    "a fractious animal that would not submit to the harness";
    - refractory, recalcitrant, incalcitrant [non-standard]
  2. Easily irritated or annoyed
    "an incorrigibly fractious young man";
    - cranky [informal], irritable, nettlesome, peevish, peckish [N. Amer, informal], pettish, petulant, scratchy, testy, tetchy, techy, pouty, narky [Brit, slang]
  3. Unpredictably difficult in operation; likely to be troublesome
    "rockets were much too fractious to be tested near thickly populated areas"; "fractious components of a communication system"

See also: difficult, disobedient, hard, ill-natured