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doubt

 
/dɑʊt/ n [C/U]

Definition

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.
(Definition of doubt n from the Cambridge Academic Content Dictionary © Cambridge University Press)

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