I don't think he'll pass
odds
The odds are against him passing
odds
The odds are on her passing.
The odd are that she will pass.
It is odds-on that she will pass.
likely
We are not likely to see him again.
We are far from sure of the outcome.
The outcome is far from certain.
probably
He probably won't pass.
probability
In all probability, she will pass.
The probability of her passing is high.
surprise
It would be a surprise if we saw him again.
It would come as a surprise if we saw him again.
uncertainty
unlikely
It is unlikely that he will pass.
He is unlikely to pass.
doubt
I have little (or no) doubt that she'll pass.
I don't doubt that she'll pass.
chances
The chances are we won't see him again.
There is little/ not much chance we'll see him again.
There is little/not much chance of us/our seeing him again.
unpredictable
The outcome is unpredictable.
There is little/ no likelihood of him/his passing.
bound
(I feel) she is bound to pass.
prospects
There are few prospects of our seeing him again.
The prospects of our/us seeing him again are slim.
certainty
There is/can be no certainty about the outcome.
The outcome is far from being a certainty.
doubt
I doubt if/whether he will pass.
I have my doubts as to whether he will pass.
prospects
Her prospects of passing are very good.
The prospects of her passing are very good.
She has good prospects of passing.
well
laps of the gods
The outcome is in the lap of gods.