Meaning of “unlikely” - Learner’s Dictionary

unlikely

adjective us uk /ʌnˈlaɪkli/
The court is unlikely to accept such tenuous evidence.It is unlikely that the judge will reverse his decision.We knew from the outset that we were unlikely to win.It is highly unlikely that they will succeed.It's unlikely that she'll arrive on time.
NOT HAPPEN

B1 not expected to happen:

[ + (that) ] It's unlikely that I'll be able to come to the party.
[ + to do sth ] He's unlikely to arrive before midday.
NOT TRUE

probably not true:

an unlikely explanation

(Definition of “unlikely” from the Cambridge Learner’s Dictionary © Cambridge University Press)