Read the dictionary definition of doubtful. All definitions for this word.
1. fraught with uncertainty or doubt
1. they were doubtful that the cord would hold
2. it was doubtful whether she would be admitted
3. dubious about agreeing to go
2. open to doubt or suspicion
1. the candidate's doubtful past
2. he has a dubious record indeed
3. what one found uncertain the other found dubious or downright false
4. it was more than dubitable whether the friend was as influential as she thought
3. unsettled in mind or opinion
1. drew a few tentative conclusions
