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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
it is unclear why
Grammar usage guide and real-world examplesUSAGE SUMMARY
"it is unclear why" is a perfectly acceptable phrase in written English.
You can use it any time you want to express that something cannot be explained or understood. For example, "It is unclear why the store closed so suddenly."
✓ 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
It is unclear why.
News & Media
But it is unclear why rates fall.
News & Media
MOSCOW — It is unclear why they gathered.
News & Media
It is unclear why sales were halted.
News & Media
It is unclear why the plane crashed.
News & Media
It is unclear why people threatened by malaria misuse ITNs.
It is unclear why these two SMC1 variants have evolved.
Science
It is unclear why the bank abandoned the earlier wording.
News & Media
It is unclear why this dynamic exists, Dr. Iralu said.
News & Media
It is unclear why Ms. Gaskin left the hospital.
News & Media
It is unclear why the proposal was voted down.
News & Media
Expert writing Tips
Best practice
When using "it is unclear why", ensure that the context clearly indicates what the uncertainty refers to. Avoid ambiguity by specifying the subject or situation that lacks a clear explanation.
Common error
Avoid relying too heavily on "it is unclear why" as a substitute for deeper analysis or investigation. Instead of simply stating the lack of clarity, attempt to offer possible explanations or directions for further inquiry.
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "it is unclear why" functions as an introductory clause expressing a lack of understanding or explanation for a particular situation or event. Ludwig AI confirms this usage with numerous examples across diverse contexts.
Frequent in
News & Media
68%
Science
30%
Formal & Business
2%
Less common in
Academia
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, "it is unclear why" is a versatile phrase used to express a lack of understanding or explanation. Ludwig AI indicates that the phrase is grammatically sound and very common, appearing most frequently in news and scientific writing. While suitable for a range of contexts, it's important to provide surrounding details regarding the nature of the uncertainty. Consider alternative phrases like "it remains uncertain why" for slight variations in emphasis. When using "it is unclear why", ensure that the context clearly indicates what the uncertainty refers to and to further clarify the absence of a readily apparent reasoning.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
it remains uncertain why
Replaces "is unclear" with "remains uncertain", emphasizing the persistence of the uncertainty.
the reasons why are not clear
Shifts the focus to the reasons themselves being unclear, rather than the situation.
it's not known why
Uses a more direct and informal tone, replacing "is unclear" with "is not known".
the explanation for why is missing
Highlights the absence of an explanation.
it is not obvious why
Emphasizes the lack of readily apparent reasons.
it is difficult to understand why
Focuses on the difficulty in comprehending the reasons.
the cause remains unknown
More concise, focusing on the unknown cause.
the rationale is obscure
Uses a more formal and technical term, "rationale", to indicate the reason or logic.
the motive is not apparent
Specifically refers to the "motive" or intention behind an action.
the reasons are shrouded in mystery
Employs figurative language to convey the sense of uncertainty and hidden reasons.
FAQs
How can I use "it is unclear why" in a sentence?
Use "it is unclear why" to introduce a statement where the reason or explanation for something is not known or understood. For instance, "it is unclear why the project was suddenly cancelled".
What are some alternatives to "it is unclear why"?
You can use alternatives such as "it remains uncertain why", "the reasons why are not clear", or "it's not known why" depending on the context.
Is "it is unclear why" formal or informal?
"It is unclear why" is generally considered suitable for both formal and informal writing. However, the surrounding language will influence the overall tone.
What's the difference between "it is unclear why" and "it is not clear why"?
The phrases "it is unclear why" and "it is not clear why" are largely interchangeable and have very similar meanings. Both indicate a lack of understanding or explanation. The choice between them often comes down to personal preference.
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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
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested