在生活和工作中，我们经常能遇到一种人，他们特别的“嘴硬”，明知自己做错了事情却不承认。

“嘴硬（literally hard mouth）”，比喻“自知理亏而口头上不肯认错或服输”，英文翻译为“stubborn and reluctant to admit mistakes or defeats”。

其反义词为“服软”，翻译为“admit defeat；acknowledge one's mistake”。

例句：

明明错了，就不要再嘴硬了。

It's obvious that you are wrong, so don't stubbornly insist that you are not.

做错了事还嘴硬什么？

Why don't you admit your mistakes?