Pronunciation: /ˈdaʊtfʊl, -f(ə)l/
adjective
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1feeling uncertain about something: he looked doubtful, but gave a nod I was doubtful of my judgement
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2not known with certainty: the fire was of doubtful origin
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improbable: [with clause]: it is doubtful whether these schemes have any lasting effect
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not established as genuine or acceptable: of doubtful legality
