no doubt
3 synonyms 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.
no doubt about it
there is no doubt that
you will no doubt recall
The adverb is neutral and common in writing; the one-word agreement use is casual speech only.
Etymology
Inherited from Middle English ne doute, a calque of Old French saunz doute, itself borrowed unadapted into Middle English.
Full origin of no doubt →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'.
