When You Do Something Without Thinking

When You Do Something Without Thinking

What is the word without thinking? ۔

Suddenly, I was ... mentally blocked. Which word / phrase makes you think without thinking? The word that comes to mind unconsciously, but I know it's not.

Is this an unwanted term? I think so, but I'm not sure.

10 points for the best answer. Thank you very much!

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When You Do Something Without Thinking