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
could not be confirmed
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "could not be confirmed" is correct and usable in written English.
It can be used when indicating that something has not been verified or validated. Example: "The details of the incident could not be confirmed by the authorities at this time."
✓ 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
60 human-written examples
Those claims could not be confirmed.
News & Media
The casualty reports could not be confirmed.
News & Media
The report could not be confirmed.
News & Media
But that report could not be confirmed.
News & Media
The accounts could not be confirmed.
News & Media
Those reports could not be confirmed.
News & Media
That number could not be confirmed.
News & Media
But the accusations could not be confirmed.
News & Media
The death toll could not be confirmed.
News & Media
Her account could not be confirmed.
News & Media
That report could not be confirmed independently.
News & Media
Expert writing Tips
Best practice
When reporting information that "could not be confirmed", clearly state the source of the unconfirmed information to maintain transparency and avoid spreading misinformation.
Common error
Avoid presenting information that "could not be confirmed" as factual or definitive. Use cautious language and clearly indicate the uncertainty surrounding the information.
Source & Trust
89%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "could not be confirmed" functions as a qualifier, indicating that certain information or reports lack validation or verification. It's commonly used to express uncertainty or a lack of definitive proof. As Ludwig AI states, this usage is correct.
Frequent in
News & Media
90%
Science
5%
Formal & Business
3%
Less common in
Academia
1%
Encyclopedias
0.5%
Reference
0.5%
Ludwig's WRAP-UP
In summary, "could not be confirmed" is a grammatically correct and very common phrase used to indicate that a piece of information lacks verification. As Ludwig AI confirms, the phrase is suitable for use in written English. It is most frequently found in news and media contexts, serving to convey uncertainty or a lack of definitive proof. When using the phrase, transparency regarding the source of unconfirmed information is crucial. Alternatives like "remained unverified" or "was not verified" can be used depending on the specific nuance required.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
could not be verified independently
This emphasizes that verification efforts from independent sources were unsuccessful.
information was unconfirmed
This is a more succinct way of stating that the information hasn't undergone confirmation.
no confirmation was available
This highlights the absence of any confirming information.
was not verified
This alternative is a more direct and concise way of saying that the information hasn't been proven true.
remained unverified
This alternative focuses on the lack of verification, emphasizing that the information's status is still uncertain.
was not substantiated
Similar to "remained unsubstantiated", this indicates a lack of evidence to support a claim.
remained unsubstantiated
This suggests that the claim lacks evidence or support, making it difficult to accept as fact.
the authenticity was not established
This alternative directly addresses the question of genuineness.
details remained unclear
This focuses on the ambiguity and lack of clarity surrounding the specifics of a situation.
evidence was lacking
This points out that there was a scarcity of evidence.
FAQs
How can I use "could not be confirmed" in a sentence?
You can use "could not be confirmed" to indicate that a piece of information lacks verification, like: "The initial reports of casualties "could not be confirmed" by independent sources."
What are some alternatives to "could not be confirmed"?
Alternatives include "remained unverified", "was not verified", or "remained unsubstantiated", depending on the specific context and nuance you want to convey.
Is it appropriate to use "could not be confirmed" in formal writing?
Yes, "could not be confirmed" is appropriate for formal writing, especially in news reports, academic papers, and professional communications, when indicating uncertainty about information.
What does it mean when a report "could not be confirmed independently"?
It means that while some reports exist, there's no verification of those reports from a separate, unbiased source. Independent confirmation strengthens the credibility of information.
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
89%
Authority and reliability
4.5/5
Expert rating
Real-world application tested