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no doubt

No doubt expresses a personal opinion. It means‘probably’ or ‘I suppose’; it does not mean ‘certainly’.

  • No doubt it’ll rain soon.
  • You’re tired, no doubt. I’ll make you a cup of tea.

To say that something is certain, we can use there is no doubt that (formal), without any doubt (formal), certainly, definitely.

  • There is no doubt that the world is getting warmer. (not No doubt the world is getting warmer.)
  • Cycling is certainly healthier than driving. (not No doubt cycling is healthier than driving.)

Doubtless is similar to no doubt (but more formal); undoubtedly is similar to there is no doubt that.

note

For structures with the verb doubt, (see here).