形容詞 temperamental:

1. relating to or caused by temperament
2. subject to sharply varying moods
   同義詞：moody
3. likely to perform unpredictably- Osbert Lancaster
   同義詞：erratic

1. A physiological or temperamental peculiarity.
   特異性格一種心理的或脾氣上的特異性
2. Nigel is temperamental but he's very highly strung, you know.
   奈杰變化無常，但你知道他是很容易激動的。