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
unclear of
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "unclear of" is not correct in standard written English.
The correct expression is "unclear about." Example: "I am unclear about the requirements for the project."
⚠ May contain grammatical issues
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
"Because they are unclear of their intentions".
News & Media
Most unclear of all was the expected result.
News & Media
It is unclear, of course, whether the world needs another encyclopedia.
News & Media
Tom Inns, the school's director, is unclear of its future role.
News & Media
It is still unclear, of course, if the Kerry drive here among veterans will yield votes.
News & Media
Just how much the demand for financial innovation will fade is unclear, of course.
News & Media
It is unclear, of course, what might come of this whistle-blower complaint.
News & Media
IT is unclear, of course, how these court cases will turn out.
News & Media
It is unclear, of course, whether an increase in reserves is in the cards for CVB.
News & Media
It is unclear, of course, if advertisers will be able to produce shows that will hold consumer attention.
News & Media
In the meantime, players contracted for as many as four more years are unclear of their futures.
News & Media
Expert writing Tips
Best practice
When expressing a lack of understanding, consider the nuance you want to convey. "Uncertain" emphasizes doubt, while "vague" points to a lack of detail.
Common error
The most frequent error is using the preposition "of" instead of "about" after "unclear." Double-check your preposition choice and use "unclear about" to ensure grammatical accuracy.
Source & Trust
82%
Authority and reliability
2.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "unclear of" functions as a prepositional phrase, typically modifying a verb or noun to express a state of uncertainty or lack of understanding. Ludwig's examples show it frequently used to describe someone's state of mind or a situation's ambiguity. However, this construction is considered non-standard.
Frequent in
News & Media
54%
Science
37%
Wiki
2%
Less common in
Formal & Business
0%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, while the phrase "unclear of" appears frequently across various sources, including news and scientific publications, it is generally considered grammatically incorrect in standard written English. As Ludwig AI indicates, the correct and preferred alternative is "unclear about" or "unsure of". To maintain grammatical correctness, especially in formal writing, it is best to avoid using "unclear of" and instead opt for the more accepted alternatives. Understanding the nuances of prepositional usage will enhance clarity and credibility in your writing.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
unsure of
Replaces "unclear" with "unsure", focusing on a feeling of uncertainty.
uncertain about
Uses "uncertain" instead of "unclear", and "about" as the preposition.
doubtful about
Emphasizes doubt rather than a simple lack of clarity.
vague about
Highlights the lack of specific details or clarity regarding a topic.
hazy about
Suggests a lack of clarity, similar to something being obscured by haze.
in the dark about
Indicates a complete lack of knowledge or awareness.
uninformed about
Focuses on the lack of information as the cause of uncertainty.
misinformed about
Suggests having incorrect information, leading to a lack of clarity.
ignorant of
Highlights a lack of knowledge, often implying a lack of awareness.
oblivious to
Implies a lack of awareness or attention to something.
FAQs
What is the correct preposition to use after "unclear"?
The correct preposition to use after "unclear" is "about". While some instances of "unclear of" exist, they are generally considered grammatically incorrect. Therefore, use "unclear about".
Is "unclear of" ever grammatically correct?
In standard English, "unclear of" is generally considered incorrect. The correct and widely accepted form is "unclear about". It's best to avoid "unclear of" in formal writing.
What can I say instead of "unclear of"?
Instead of "unclear of", you can use alternatives like "unclear about", "unsure of", or "uncertain about" depending on the specific context.
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
82%
Authority and reliability
2.8/5
Expert rating
Real-world application tested