doubtful

a. 可疑的,疑心的,不确的

Because of a long drought, the farmers are doubtful about the prospect of a good yield.

因为长时间的干旱，农民们对于好收成的前景是怀疑的。

It is doubtful whether he can read my fortune or not.

他能否算出我的运气还是个疑问。