Learn what "you've always been a bad liar" means, when people say it, and how to use it naturally in English.

This means the speaker thinks the other person is lying badly or that the lie is obvious.
From On One Condition, Episode 39
The speaker insults someone's ability to lie.
Use it in an argument when you want to call out a lie directly. It can sound insulting and confrontational, so it is not polite.
Scenes unlock real expressions as you watch
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