moody

The moody teenager spent the whole afternoon locked in his room after a minor argument.

(Chinese) 那个情绪化的小伙子因为一点小争吵，整个下午都把自己锁在房间里。

I find it hard to work with a boss who is so moody that you never know what to expect.

(Chinese) 我觉得很难与这样一个喜怒无常的老板共事，因为你永远不知道他下一秒会是什么情绪。