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English definition of “doubtful”

doubtful

adjective uk   /ˈdaʊt.fəl/ us  
B2 If you are doubtful about something, you are uncertain about it: The teacher is doubtful about having parents working as classroom assistants. B2 If a situation is doubtful, it is unlikely to happen or to be successful: It is doubtful whether/if they ever reached the summit before they died. It was doubtful that the money would ever be found again.
doubtfully
adverb uk   /-i/ us  
"Are you telling me the truth?" he asked doubtfully.
(Definition of doubtful from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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