no doubt
3 synonyms and 0 antonyms for no doubt, grouped by meaning and by how common each one is.
Adverb — Very probably; used to show that the speaker assumes something is true without being able to prove it.
Synonyms
Everyday swaps
Common words most readers know — safe in any writing.
Rare, literary or technical
Precise, but they will stand out — check the sense before using one.
How to Use No Doubt
The word patterns that sound natural to a native speaker.
The adverb is neutral and common in writing; the one-word agreement use is casual speech only.
Frequently Asked Questions
What is the difference between no doubt and undoubtedly?
Undoubtedly states that something is genuinely certain. No doubt is usually weaker and often slightly ironic: it signals a confident assumption rather than proven fact, as in 'he will no doubt blame the weather'.
Is it no doubt or without a doubt?
Without a doubt is stronger and means truly certain. No doubt often carries a hint of 'I assume', so if you mean genuine certainty, use without a doubt.
Can no doubt be a full answer?
Yes. In informal speech, especially American English, 'No doubt' on its own means 'I agree completely'.