words fail me 可以用来表达震惊、惊讶、惊愕，尤其是你在经历某些事情后一时找不到合适的词汇来表达自己的思想和情感时。

I wish I could let you know how much it means to me having you all here， but words fail me at the moment.

我真想让你知道你在这对我来说意味着什么，但是我真的不知说什么好。

A： Have you seen how she treats badly her daughter?

你看见她怎么对她女儿了么?

B： Yes， words fail me。 I‘ve never seen anything quite like that.

看见了，我都没话说了。我从没见过那样的人。