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English definition of “doubtful”

doubtful

adjective    /ˈdɑʊt·fəl/
uncertain or unlikely: [+ (that) clause] It was doubtful (that) the money would ever be found. She gave me a long, doubtful look (= look full of doubt) and told me to wait.
(Definition of doubtful adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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