English phrase from drama scenes

What Does "i don't know what he's capable of" Mean?

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

Intermediate
Neutral
Soft
Express Doubt

I don't know what he's capable of.

It means the speaker is unsure how far the person might go or what harm they might cause.

From Mysterious Murderer, Episode 40

When do people say this?

Scene Context

Someone admits they do not know how dangerous the other person may be.

Usage Scenario

Use this when warning others that someone may be dangerous or unpredictable. It is common in serious conflict or thriller-style contexts.

Better ways to say it

1
I don't know what he's capable of.
2
I don't know what he might do.
3
He could do anything.

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