孩子们因为下雨不能出去玩而显得很不开心。

The children looked ___unhappy when they couldn't go outside to play because of the rain.

她今天看起来不太开心。

She looks a bit ___unhappy today.

这个故事有一个悲伤的结局，让我感到难过。

This story has a sad ending, it makes me feel ___unhappy.