|Open to doubt or suspicion.|
The candidate's doubtful past.
He has a dubious record indeed.
What one found uncertain the other found dubious or downright false.
It was more than dubitable whether the friend was as influential as she thought.
|Fraught with uncertainty or doubt.|
They were doubtful that the cord would hold.
It was doubtful whether she would be admitted.
Dubious about agreeing to go.