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
I'm uncertain
Grammar usage guide and real-world examplesAlternative expressions(6)
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
30 human-written examples
I'm uncertain and worried.
News & Media
I'm uncertain about my relationships.
News & Media
I'm uncertain why that is — am I out of practice?
News & Media
I'm uncertain whether any suitable alternative vehicles are currently available for handicapped conversion.
News & Media
I'm uncertain about Featherstone's claim, which may be true, but is unprovable.
News & Media
I'm uncertain how the risks of these provisions will affect our financial markets, but they deserve close attention.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
29 human-written examples
i do not know if i know how not to be paranoid, and i am uncertain if it matters at all.
News & Media
I was uncertain how to take this.
News & Media
"I was uncertain about what was being accomplished".
News & Media
A year ago, I was uncertain about the Lasix issue.
News & Media
I am uncertain if my car will make the trip.
News & Media
Expert writing Tips
Best practice
When expressing uncertainty, follow "I'm uncertain" with a clear explanation of what you are uncertain about. This provides context and avoids ambiguity.
Common error
Avoid using "I'm uncertain" as a filler phrase. Ensure it genuinely reflects a lack of knowledge or clarity, and provide context to support your uncertainty.
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "I'm uncertain" primarily functions as a declarative statement expressing the speaker's state of doubt or lack of definite knowledge. It introduces a subjective assessment or acknowledgment of not being sure about something, as demonstrated in examples provided by Ludwig.
Frequent in
News & Media
70%
Science
15%
Formal & Business
5%
Less common in
Encyclopedias
0%
Wiki
5%
Reference
0%
Ludwig's WRAP-UP
The phrase "I'm uncertain" is a common and grammatically correct way to express doubt or lack of definite knowledge. Ludwig's analysis of numerous examples from reputable sources like The New York Times and The Guardian, confirms this. While it is considered acceptable, it is important to provide context when using this phrase to avoid ambiguity. Consider related phrases like "I'm unsure" or "I'm not sure" for similar meanings. As Ludwig AI suggests, this phrase can be used in various settings, with News & Media being the most frequent context.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
I'm unsure
Replaces "uncertain" with "unsure", a direct synonym expressing a lack of certainty.
I'm not sure
Expresses uncertainty in a slightly more informal tone.
I'm doubtful
Indicates a stronger degree of skepticism or disbelief.
I have my doubts
Expresses uncertainty as a reservation or concern.
I'm hesitant
Suggests a reluctance or unwillingness due to uncertainty.
I'm apprehensive
Implies a feeling of anxiety or fear about possible outcomes.
I'm of two minds
Expresses indecision or conflicting opinions.
I'm in two minds
This is a British English variant that expresses indecision or conflicting opinions.
I'm not convinced
Indicates a lack of belief or persuasion.
I'm skeptical
Expresses a general tendency to doubt or question claims.
FAQs
How to use "I'm uncertain" in a sentence?
Use "I'm uncertain" to express doubt or a lack of definite knowledge about something. For example, "I'm uncertain whether the project will be completed on time."
What can I say instead of "I'm uncertain"?
You can use alternatives like "I'm unsure", "I'm not sure", or "I'm doubtful" depending on the context.
Which is correct, "I'm uncertain" or "I'm not certain"?
Both "I'm uncertain" and "I'm not certain" are grammatically correct and express the same meaning. The choice between them is a matter of personal preference.
What's the difference between "I'm uncertain" and "I'm hesitant"?
"I'm uncertain" indicates a lack of knowledge or sureness, while "I'm hesitant" implies a reluctance to do something, often due to uncertainty or fear of potential consequences.
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
4.5/5
Expert rating
Real-world application tested