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English definition of “doubtful”

doubtful

adjective     /ˈdaʊtfəl/
NOT PROBABLE B2 not probable: It's doubtful if/whether he'll be able to come. [+ (that)] It's doubtful that anyone survived the fire.Impossible and improbable
NOT CERTAIN B2 not feeling certain about something: She's still doubtful about her decision.UncertaintyHesitatingAchievable
doubtfully adverb
(Definition of doubtful adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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