gut feeling

US /ɡʌt ˈfiːlɪŋ/
UK /ɡʌt ˈfiːlɪŋ/
"gut feeling" picture
1.

an intuition or instinct; a strong belief or feeling about something that is not based on facts or reason

:
I had a gut feeling that something was wrong.
Trust your gut feeling when making important decisions.