B2 If you are doubtful about something, you are uncertain about it.怀疑的,有疑虑的;不能确定的
B2 If a situation is doubtful, it is unlikely to happen or to be successful.不大可能的
More examples
It is doubtful whether the government will ever agree to their demands.
We were doubtful about the product's usefulness from the start.
It now looks doubtful that the building work will be completed on time.
I'm a bit doubtful about whether to take on the job, as the hours are pretty unsociable.
Many of us are doubtful about the value of these new educational strategies.
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