doubt Definition in the Cambridge English Dictionary
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Definition of “doubt” - English Dictionary

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 ​entireproject is in some doubt. [C] She is without a doubt (= ​certainly) one of the ​beststudents I’ve ​ever had.

doubtverb [T]

 us   /dɑʊt/
to be ​uncertain about something or someone, or to have ​difficultybelieving 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)

Definition of "doubt" - British English Dictionary

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doubtnoun [C or U]

uk   us   /daʊt/
B1 (a ​feeling of) not being ​certain about something, ​especially about how good or ​true it is: I'm having doubts about his ​ability to do the ​job. If there's any doubt about the rocket's ​engines, we ought to ​cancel the ​launch. The ​prosecution has to ​establish his ​guilt beyond ​reasonable doubt (US beyond a ​reasonable) doubt. This ​latestscandal has raised doubts about whether he could ​win the ​election. [+ (that)] I never had any doubt (that) you would ​win. He's the most ​attractive man in the ​room, no doubt about that/it.no doubt C1 used to ​emphasize that what you are saying is ​true or ​likely to ​happen: We will, no doubt, ​discuss these ​issues again at the next ​meeting. No doubt you'll ​want to ​unpack and have a ​rest before ​dinner.cast doubt on sth C2 to make something ​seemuncertain: Witnesses have ​cast doubt on the accused's ​innocence.in doubt B2 If the ​future or ​success of someone or something is in doubt, it is ​unlikely to ​continue or to be ​successful: The ​future of the ​stadium is in doubt because of a ​lack of ​money.without (a) doubt B2 used to ​emphasizeyouropinion: She is without (a) doubt the ​beststudent I have ​evertaught.
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doubtverb [T]

uk   us   /daʊt/
B2 to not ​feelcertain or ​confident about something or to ​think that something is not ​probable: I doubt whether/if I can ​finish the ​work on ​time. [+ that] They had ​begun to doubt that it could be done. He may come back ​tomorrow with the ​money, but I very much doubt it. I don't doubt his ​abilities.doubt sb/doubt sb's word C1 to not ​trust someone or ​believe what they say: He's never ​lied to me before, so I have no ​reason to doubt his word.
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(Definition of doubt from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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