temperamental
美 [.temp(ə)rə'ment(ə)l] 
英 [.temprə'ment(ə)l] 
- adj.喜怒无常的;容易激动的;反复无常的;气质的
 - 网络性情的;气质上的;神经质
 
temperamental
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1.  | 喜怒无常的;容易激动的;反复无常的having a tendency to become angry, excited or upset easily, and to behave in an unreasonable way  | 
You never know what to expect with her. She's so temperamental. 你永远说不清她要干什么。她一时一变。  | |
The printer's being temperamental this morning. 今天上午这台打印机时好时坏。  | 
2.  | 气质的;性情的;性格的connected with sb's nature and personality  | 
They are firm friends in spite of temperamental differences. 他们尽管性格不同,但仍然友情甚笃。  |