doubt Definition in Cambridge American English Dictionary
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Definition of "doubt" - American English Dictionary

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doubtnoun [C/U]

 us   /dɑʊt/
a feeling of not knowing what to believe or what to do, or the condition of being uncertain: [C] If you have any doubt about her ability, don’t hire her. [+ that clause] There’s no doubt that the show will be successful. [U] The future of the entire project is in some doubt. [C] She is without a doubt (= certainly) one of the best students I’ve ever had.

doubtverb [T]

 us   /dɑʊt/
to be uncertain about something or someone, or to have difficulty believing something: [T] He may come back tomorrow with the money, but I doubt it.
(Definition of doubt from the Cambridge Academic Content Dictionary © Cambridge University Press)
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