It's very improbable to happen.
It's very unlikely to happen.
Is one of them stronger in meaning than the other?
anonymous It's very improbable to happen. Not grammatical. You need the following.
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anonymousIt's very improbable to happen.
Not grammatical. You need the following.
It's very improbable that it will happen.
anonymousIt's very unlikely to happen.
OK.
anonymousIs one of them stronger in meaning than the other?
No.
CJ