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
dubious of
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "dubious of" is not correct in standard written English; the correct expression is "dubious about." You can use "dubious about" when expressing uncertainty or skepticism regarding a particular idea, claim, or situation.
Example: "She was dubious about the effectiveness of the new marketing strategy."
⚠ May contain grammatical issues
News & Media
Science
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
58 human-written examples
Some elected officials were dubious of Mr. Bloomberg's sincerity.
News & Media
Jowitt is rightly dubious of an ongoing evangelical adventure.
News & Media
"I see you are dubious of the proposition".
News & Media
Many engineers he spoke to were dubious of his project.
News & Media
Perhaps the most dubious of accessories is children.
News & Media
A surprising number of people close to the case are dubious of Mohammed's confession.
News & Media
Dubious of Mr. Hofmeyr's claims on Facebook, Mr. Rademeyer commissioned an investigation.
News & Media
Once that genie is out of the bottle, Asians are dubious of a policy fix.
News & Media
To the uninitiated, these clandestine directories make the most dubious of all literary subgenres.
News & Media
(Mr. Gulland was more dubious of the value of such products).
News & Media
3. Stay.com I'm generally dubious of sites that claim they can plan your trip for you.
News & Media
Expert writing Tips
Best practice
While "dubious of" is commonly used, favor the grammatically correct alternative "dubious about" in formal writing to maintain clarity and precision.
Common error
Many writers mistakenly use "of" after "dubious", influenced by similar phrases. Always double-check preposition usage to ensure grammatical correctness; in this case, "dubious about" is the standard form.
Source & Trust
85%
Authority and reliability
3.2/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "dubious of" functions as an adjective phrase followed by a preposition, typically modifying a noun or pronoun to express doubt or skepticism. Ludwig reports that it's not correct in standard written English; the correct expression is "dubious about."
Frequent in
News & Media
60%
Wiki
15%
Science
10%
Less common in
Formal & Business
5%
Encyclopedias
5%
Reference
5%
Ludwig's WRAP-UP
While "dubious of" is a prevalent expression used to indicate doubt or skepticism, it's crucial to recognize that it is grammatically incorrect. According to Ludwig, the correct phrasing is "dubious about". Despite its common occurrence in various sources, especially news and media, opting for "dubious about" ensures grammatical accuracy and strengthens the clarity of your writing. Therefore, while you may encounter "dubious of" frequently, adopting "dubious about" is a best practice for formal and precise communication.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
skeptical about
Indicates doubt or disbelief, focusing on a questioning attitude towards something.
doubtful about
Suggests uncertainty or a lack of conviction regarding the truth or reliability of something.
unsure about
Implies a lack of certainty or confidence in a particular matter.
questioning
Highlights the act of inquiring or expressing doubts about something.
suspicious of
Suggests a feeling of mistrust or wariness towards someone or something.
leery of
Indicates caution and reluctance due to potential danger or problems.
apprehensive about
Expresses anxiety or fear about a future event or situation.
distrustful of
Implies a lack of trust and a tendency to doubt the honesty or reliability of someone or something.
incredulous about
Shows disbelief or skepticism, often in response to something surprising or hard to believe.
hesitant about
Indicates reluctance or unwillingness to do something due to uncertainty or fear.
FAQs
Is it correct to say "dubious of"?
No, while commonly used, "dubious of" is considered grammatically incorrect. The correct phrasing is "dubious about".
What does "dubious about" mean?
"Dubious about" means having doubts or uncertainty about something. It suggests a lack of conviction or skepticism.
What can I say instead of "dubious of"?
Instead of "dubious of", you can use alternatives like "skeptical about", "doubtful about", or "unsure about" depending on the specific context.
What's the difference between "dubious of" and ""dubious about""?
While "dubious of" is often used, it is grammatically incorrect. "Dubious about" is the correct and widely accepted form, expressing uncertainty or skepticism.
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
85%
Authority and reliability
3.2/5
Expert rating
Real-world application tested