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Adjective: irritable  i-ri-tu-bul
  1. Easily irritated or annoyed
    "an incorrigibly irritable young man";
    - cranky, fractious, nettlesome, peevish, peckish, pettish, petulant, scratchy, testy, tetchy, techy, pouty, narky [Brit]
  2. (pathology) abnormally sensitive to a stimulus
  3. (physiology) capable of responding to stimuli
    - excitable

See also: ill-natured, sensitive

Encyclopedia: Irritable