not likely
US /nɑt ˈlaɪkli/
UK /nɑt ˈlaɪkli/

1.
poco probable, improbable
used to say that something is certainly not true or will certainly not happen
:
•
“Will he apologize?” “Not likely!”
“¿Se disculpará?” “¡Poco probable!”
•
“Do you think they’ll win?” “Not likely, they’re playing against the champions.”
“¿Crees que ganarán?” “¡Poco probable, están jugando contra los campeones!”