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WordNet-Online
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Adjective doubtful has 3 senses
- doubtful, dubious, dubitable, in question - 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"- Karen Horney
Antonym: unquestionable (indirect, via questionable)
- doubtful, dubious - 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"
Antonyms: certain, sure (indirect, via uncertain, unsure)
Antonyms: certain, sure (indirect, via uncertain, unsure)
- doubtful, tentative - unsettled in mind or opinion; "drew a few tentative conclusions"
Antonym: settled (indirect, via unsettled)
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