words fail me 可以用來表達震驚、驚訝、驚愕，尤其是你在經歷某些事情后一時找不到合適的詞匯來表達自己的思想和情感時。

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

我真想讓你知道你在這對我來說意味著什么，但是我真的不知說什么好。

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

你看見她怎么對她女兒了么?

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

看見了，我都沒話說了。我從沒見過那樣的人。