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src: wikipedia
- Definition
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- doubtful :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
- doubtful :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
- doubtful :unsettled in mind or opinion
- drew a few tentative conclusions