as likely as not
US /æz ˈlaɪkli æz nɑːt/
UK /æz ˈlaɪkli æz nɑːt/

1.
fort probablement, très probablement
very probable; almost certain
:
•
As likely as not, he'll be late again.
Fort probablement, il sera encore en retard.
•
She'll as likely as not forget about the meeting.
Elle va fort probablement oublier la réunion.