Temperamental

temperamental /ˌtemprəˈmentl/

adj. 喜怒无常的，情绪化的

It means that someone has a tendency to become angry, excited or upset easily, and to behave in an unreasonable way.

它指的是某人很容易生气、激动或不安，且行为不合理。

Linda is very temperamental, so her colleagues don't like her.

Linda非常情绪化，所以她的同事不大喜欢她。

You never know what to expect with him. He's so temperamental.

你永远说不清他要干什么，他一时一变。