temperamental
adjective uk/ˌtem.pər.əˈmen.təl/ /ˌtem.prəˈmen.təl/ us/ˌtem.pɚ.əˈmen.t̬əl/
(PERSON)
喜怒无常的
A temperamental person is someone whose mood often changes very suddenly.
Be careful how you approach her - she's very temperamental. 同她接触你要注意方式——她这人喜怒无常。
气质的；性情的；性格的
caused by your own character and feelings
There are temperamental similarities between the brothers. 兄弟俩在性情上有些相似。
(MACHINE)
informal（机器）性能不稳定的；时好时坏的
A temperamental machine sometimes works and sometimes does not.
You have to treat our DVD player very carefully - it's old and temperamental. 你用我们的光盘机时得格外小心——它很旧了，而且性能不稳定。