gut feeling / reaction

/ɡˈʌt fˈiːlɪŋ ɹɪˈakʃən/

/ɡˈʌt fˈiːlɪŋ ɹɪˈækʃən/

a belief that is strong, yet without any explainable reason

Examples

1. Johnson finds that he has an instant gut reaction to each pair of eyes.

2. When you know that something is up, when you have that gut feeling that something is up, don't drag it on any more than it has to.

3. I had a gut feeling that things were going to change a little bit.

4. There are risks involved in any great human endeavor, and we have to make an informed decision, rather than rely on gut feeling.