Learn what "i don't know what he's capable of" means, when people say it, and how to use it naturally in English.

It means the speaker is unsure how far the person might go or what harm they might cause.
From Mysterious Murderer, Episode 40
Someone admits they do not know how dangerous the other person may be.
Use this when warning others that someone may be dangerous or unpredictable. It is common in serious conflict or thriller-style contexts.
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