怅惘是一种心里又难过又迷茫的感觉，好像失去了什么，却又说不清楚。

"怅惘" is a feeling of sadness and confusion, as if something is lost but you can't quite explain it.

这个词比较书面，常常用在文章里，形容一种淡淡的失落。

This word is quite literary, often used in writing to describe a subtle sense of loss.