moody

他这几天情绪多变，一会儿高兴一会儿生气。

He's been very ___moody these days, happy one moment and angry the next.

别理那个闷闷不乐的家伙，他就是个爱闹脾气的人。

Ignore that sulky guy, he's always being a ___moody.

这部电影的忧郁色调营造出了一种沉思的氛围。

The ___moody color palette of the film created a contemplative atmosphere.