ir·ri·ta·ble /ˈɪrətəbəl/
  (a.)易怒的,急躁的
  ir·ri·ta·ble /ˈɪrətəbəl/ 形容詞
  應激性的,過敏的
  Ir·ri·ta·ble a.
  1. Capable of being irritated.
  2. Very susceptible of anger or passion; easily inflamed or exasperated; as, an irritable temper.
     Vicious, old, and irritable.   --Tennyson.
  3. Physiol. Endowed with irritability; susceptible of irritation; capable of being excited to action by the application of certain stimuli.
  4. Med. Susceptible of irritation; unduly sensitive to irritants or stimuli. See Irritation, n., 3.
  Syn: -- Excitable; irascible; touchy; fretful; peevish.
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  irritable
       adj 1: easily irritated or annoyed; "an incorrigibly fractious
              young man"; "not the least nettlesome of his
              countrymen" [syn: cranky, fractious, nettlesome,
               peevish, peckish, pettish, petulant, testy,
               tetchy, techy]
       2: abnormally sensitive to a stimulus
       3: capable of responding to stimuli [syn: excitable]