Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
an undoubted fact
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "an undoubted fact" is correct and usable in written English.
It can be used to emphasize that something is unquestionably true or accepted as a fact. Example: "It is an undoubted fact that climate change is affecting weather patterns globally."
✓ Grammatically correct
News & Media
Science
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
3 human-written examples
For example, the human genome exists in every one of us, and is therefore our shared heritage and an undoubted fact of nature.
News & Media
Nevertheless, it was an undoubted fact that the quantity of smoke that was produced was far more than was necessary; and if they directed their efforts only against that which was unnecessary, he should join in the movement as heartily as anybody.
News & Media
It is an undoubted fact that much is expected from developing countries especially those in Africa and Asia.
Human-verified similar examples from authoritative sources
Similar Expressions
57 human-written examples
"[It is an] undoubted fact that we are becoming dangerously used to speaking and thinking of 'an ageing population' as a problem, a burden on public purse and private resources alike," said Dr Williams.
News & Media
So, despite the genuine good intentions of Britain's most accomplished athlete of recent times, and the undoubted fact that a corner of sorts has been turned in school sport provision, talk of a transformation appears premature.
News & Media
The virtue ethics approach begins from the undoubted fact that Buddhist texts devote a great deal of attention to what kind of people we should strive to be and what virtues we should seek to cultivate in ourselves.
Science
One is the undoubted fact that inflation in China, which is raising labor costs in particular, is gradually eliminating that nation's currency undervaluation.
News & Media
There is also the undoubted fact that the whole process known as "Oslo" -- it could be called "Clinton" -- has faltered, and may be near death.
News & Media
Part of the answer may be the undoubted fact that many people are now investing in oil futures — which feeds suspicion that speculators are running the show, even though there's no good evidence that prices have gotten out of line.
News & Media
These undoubted facts, true throughout the ages, will eventually reassert themselves, and the thrust of nature will return.
News & Media
This is an undoubted achievement.
News & Media
Expert writing Tips
Best practice
Use "an undoubted fact" to introduce a statement that is widely accepted and supported by evidence, strengthening your argument or assertion.
Common error
Avoid using "an undoubted fact" in casual conversation or informal writing, as it can sound overly formal or even pretentious. Opt for simpler phrasing like "it's true" or "it's clear" instead.
Source & Trust
87%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "an undoubted fact" functions as a noun phrase acting as a subject complement or an appositive. It serves to introduce or emphasize a statement that is considered undeniably true. As shown in Ludwig, it is used to highlight certainty.
Frequent in
News & Media
50%
Science
37%
Encyclopedias
13%
Less common in
Formal & Business
0%
Academia
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, "an undoubted fact" is a phrase used to emphasize the certainty and validity of a statement. While grammatically correct and usable, it is relatively rare in frequency. It is most commonly found in news, science, and encyclopedia contexts. Ludwig AI confirms its correct usage and provides examples from reliable sources. When writing, consider the formality of the context; in informal settings, simpler alternatives might be more appropriate.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
an indisputable fact
Replaces "undoubted" with "indisputable", emphasizing the impossibility of disputing the fact.
an undeniable fact
Substitutes "undoubted" with "undeniable", stressing that the fact cannot be denied.
an unquestionable fact
Replaces "undoubted" with "unquestionable", indicating that the fact should not be questioned.
an irrefutable fact
Uses "irrefutable" instead of "undoubted", highlighting that the fact cannot be refuted or disproven.
an incontrovertible fact
Replaces "undoubted" with "incontrovertible", indicating that the fact cannot be argued against.
a certain fact
Replaces "undoubted" with "certain", conveying a strong assurance of the fact's truth.
an established fact
Indicates the fact has been proven or widely recognized as true.
a proven fact
Replaces "undoubted" with "proven", emphasizing that there is evidence to support the fact.
a clear fact
Replaces "undoubted" with "clear", simply emphasizing its obviousness.
a plain fact
Uses "plain" instead of "undoubted", suggesting the fact is straightforward and easy to understand.
FAQs
What does "an undoubted fact" mean?
The phrase "an undoubted fact" means something that is unquestionably true or certain. It emphasizes that there is no room for doubt about the validity of the statement.
How to use "an undoubted fact" in a sentence?
You can use "an undoubted fact" to introduce a statement that is widely accepted and supported by evidence. For instance: "It is "an undoubted fact" that exercise is beneficial for health."
What can I say instead of "an undoubted fact"?
You can use alternatives like "an indisputable fact", "an undeniable fact", or "an unquestionable fact" to convey a similar meaning.
Is it redundant to say "an undoubted fact"?
While "fact" already implies truth, using "an undoubted fact" can add emphasis to the certainty of the statement. However, be mindful of overuse to avoid sounding repetitive or overly formal.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
87%
Authority and reliability
4.1/5
Expert rating
Real-world application tested