形容詞 irritable:

1. easily irritated or annoyed
   同義詞：cranky, fractious, nettlesome, peevish, peckish, pettish, petulant, scratchy, testy, tetchy, techy
2. abnormally sensitive to a stimulus
3. capable of responding to stimuli
   同義詞：excitable

1. In a bad mood; irritable.
   情緒不好的; 易發(fā)怒的
2. He's always in a bad mood (ie irritable and angry) on Mondays.
   他每星期一情緒都很壞。
3. The old man is an irritable person.
   那個(gè)老人是個(gè)易怒的人。
4. The substance is irritable to sensitive skin.
   這種物質(zhì)對(duì)敏感的皮膚有刺激性。

ir.ri.ta.ble

adj.（形容詞）
Easily irritated or annoyed.
易怒的：容易心煩或激怒的
Pathology Abnormally sensitive to a stimulus.
【病理學(xué)】 過敏的：對(duì)刺激不正常地敏感的
Physiology Capable of responding to stimuli.
【生理學(xué)】 應(yīng)激性的：能對(duì)刺激作出反應(yīng)的

來源：
French irritable
法語(yǔ) irritable
from Latin irrot3bilis
源自 拉丁語(yǔ) irrot3bilis
from irrot3re [to irritate]
源自 irrot3re [使惱怒]

【引伸】
ir.ritableness
n.（名詞）
ir.ritably
adv.（副詞）