English phrase from drama scenes

What Does "i don't know what i was thinking" Mean?

Learn what "i don't know what i was thinking" means, when people say it, and how to use it naturally in English.

Beginner
Neutral
Soft
Apologize

I don't know what I was thinking.

It means the speaker regrets their behavior and cannot explain why they acted that way.

From Rosy Psycho, Episode 50

When do people say this?

Scene Context

Someone is admitting regret and confusion about a past decision.

Usage Scenario

Use this when apologizing or expressing regret after a bad decision. It is very common and natural in emotional conversations.

Better ways to say it

1
I don't know what I was thinking.
2
I wasn't thinking.
3
I don't know what I was thinking back then.

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How to Apologize in English

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