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

1.
pouco provável, improvável
used to say that something is certainly not true or will certainly not happen
:
•
“Will he apologize?” “Not likely!”
“Ele vai pedir desculpas?” “Pouco provável!”
•
“Do you think they’ll win?” “Not likely, they’re playing against the champions.”
“Você acha que eles vão ganhar?” “Pouco provável, eles estão jogando contra os campeões.”