Learner's definition of UNLIKELY
[or more unlikely; most unlikely]
1 : not likely — used to say that something probably will not happen or is not true
It is unlikely that the company will survive more than another year.
That explanation is unlikely to be true.
an unlikely story [=a story that is hard to believe]
Her recovery is unlikely. = It is unlikely that she will recover. = She is unlikely to recover.
In the unlikely event that I win the lottery, I will pay off the mortgage.
2 always used before a noun : not seeming to be right or suited for a purpose
He was an unlikely candidate for the position.
A big city seems like an unlikely place to find wildlife.
I received support from an unlikely ally.
an unlikely combination