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

1.
おそらく, たぶん
very probable; almost certain
:
•
As likely as not, he'll be late again.
おそらく、彼はまた遅れるだろう。
•
She'll as likely as not forget about the meeting.
彼女はおそらく会議のことを忘れるだろう。
おそらく, たぶん
very probable; almost certain