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Adjective: testy (testier,testiest)  te-stee
  1. Easily irritated or annoyed
    "an incorrigibly testy young man";
    - cranky, fractious, irritable, nettlesome, peevish, peckish, pettish, petulant, scratchy, tetchy, techy, pouty, narky [Brit]

Derived forms: testiest, testier

See also: ill-natured

Encyclopedia: Testy