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
is undoubtedly
Grammar usage guide and real-world examplesUSAGE SUMMARY
The term 'is undoubtedly' is correct and usable in written English.
You can use it when you are making a statement that is widely accepted or universally accepted as the truth. For example: The sun rises in the east every day - this is undoubtedly true.
✓ Grammatically correct
News & Media
Science
Formal & Business
Encyclopedias
Wiki
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
60 human-written examples
Djokovic is undoubtedly patriotic.
News & Media
It is undoubtedly disgusting.
News & Media
He is undoubtedly correct.
News & Media
He. is undoubtedly right.
News & Media
That is undoubtedly correct.
News & Media
It is undoubtedly unstable.
News & Media
The word is undoubtedly sincere.
News & Media
And this is undoubtedly true.
News & Media
Political life is undoubtedly boring.
News & Media
This is undoubtedly the case.
News & Media
The expansion is undoubtedly mature.
News & Media
Expert writing Tips
Best practice
Avoid overuse in a single piece of writing to maintain credibility and avoid sounding hyperbolic.
Common error
Be cautious not to use "is undoubtedly" for subjective opinions or claims lacking substantial backing, as it can weaken your argument's credibility.
Source & Trust
88%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "is undoubtedly" functions as an adverbial intensifier modifying a verb. Ludwig AI confirms it's used to strengthen the assertion of a statement, indicating a high degree of certainty or agreement, similar to saying something is 'certainly' or 'without a doubt'. Examples in Ludwig show its use in various contexts to emphasize the truth or validity of a claim.
Frequent in
News & Media
66%
Science
14%
Formal & Business
6%
Less common in
Encyclopedias
4%
Wiki
3%
Reference
0%
Ludwig's WRAP-UP
The phrase "is undoubtedly" serves to strongly affirm a statement, conveying a high degree of certainty. Ludwig AI's analysis reveals it's grammatically correct and frequently used across various reputable sources like The New York Times and The Economist. While versatile, it's best to reserve this phrase for situations where you want to emphasize a point with conviction, ensuring the statement is well-supported. Overusing it can diminish its impact. Alternatives like ""is certainly"" or "is definitely" can provide a similar meaning with slightly less intensity.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
is certainly
Emphasizes sureness, less forceful than "undoubtedly".
is definitely
Similar in meaning, slightly less formal.
is without a doubt
Replaces the adverb with a prepositional phrase.
is unquestionably
Highlights the lack of any question or dispute.
is undeniably
Focuses on the impossibility of denying the statement.
is beyond question
Emphasizes that the matter is not open to debate.
is plainly
Highlights the obviousness of the statement.
is clearly
Similar to 'plainly', indicating ease of perception.
it must be
Indicates a strong likelihood based on available information.
it's bound to be
Suggests inevitability, though not as certain as "undoubtedly".
FAQs
How to use "is undoubtedly" in a sentence?
Use "is undoubtedly" to express a strong conviction or agreement with a statement. For example, "This "is certainly" a complex issue" or "The evidence "is clearly" compelling."
What can I say instead of "is undoubtedly"?
You can use alternatives like ""is certainly"", "is definitely", or "is without a doubt depending on the context."
Which is correct, "is undoubtedly" or "is doubtlessly"?
"Is undoubtedly" is more common and generally preferred in modern English. "Is doubtlessly" is grammatically correct but less frequently used.
What's the difference between "is undoubtedly" and "is possibly"?
"Is undoubtedly" conveys a strong sense of certainty, while "is possibly" indicates uncertainty or a low probability. They have opposite meanings.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
88%
Authority and reliability
4.6/5
Expert rating
Real-world application tested