temperamental
adj
1 caused by a person´s temperament 由人的气质引起的; 生来的
a temperamental aversion to hard work 生性厌恶艰苦的工作.
2 (often derog 常作贬义) having or showing fits of excitable or moody behaviour; not calm or consistent 神经质的; 不冷静的; 变化无常的
He´s avery temperamental player, ie plays well or badly accordingto his mood. 他是个情绪波动的演员(演得好坏由心情而定).
(joc 谑) My car is a bit temperamental, ie is likely to break down, fail to start, etc. 我的汽车没准脾气(可能出毛病、 发动不起来等).