B1 a state of being uncertain about something, or not trusting someone or something: I have some doubts about his ability to do the job.
have no doubt B1 to be certain: I have no doubt that I made the right decision.
there is no doubt B1 it is certain: There is no doubt that he’s a good player.
be in doubt › to not be certain: The future of the project is in doubt.
without (a) doubt › certainly: She is without doubt a great writer.
no doubt › used to say that something is very likely: No doubt she’ll spend the money on her son.