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
less than certain
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "less than certain" is correct and usable in written English.
It can be used to express doubt or a lack of confidence in a particular situation or outcome. Example: "The weather forecast is less than certain, so we should prepare for both rain and sunshine."
✓ Grammatically correct
News & Media
Science
Encyclopedias
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
53 human-written examples
But the prospects seem less than certain.
News & Media
Unlike the museum, this house, built in 1938, is facing a less than certain future.
News & Media
But even they sound less than certain how long that decision will hold.
News & Media
But something in his voice suggested that he was less than certain.
News & Media
To examine the claims of all knowledge that is less than certain.
Encyclopedias
"We will do it," Colonel Mohammed said, though he looked less than certain.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
6 human-written examples
PHILADELPHIA — The Pedro Martinez Era began on a less-than-certain note Wednesday, as the Phillies signed him and, before the ink was dry, placed him on the 15-day disabled list with a strained right shoulder.
News & Media
It is especially puzzling given that Obama faces tough midterms and a less-than-certain re-election — and given that we all now know someone on the unemployment line.
News & Media
To see the difficulty with less-than-certain evidence, consider the following example.
Science
While it may not be possible to have certain beliefs, it is quite possible to have knowledge given that we construe it as justified but less-than-certain belief.
Science
As Osler writes, "During the Renaissance and seventeenth century, the growth of empirical investigation, especially in natural history, yielded less-than-certain knowledge about the world, making it increasingly difficult to assimilate natural philosophy into the Aristotelian apodictic model for science" (Osler 1998, p. 91).
Science
Expert writing Tips
Best practice
When using "less than certain", consider the context and audience to ensure the level of uncertainty conveyed is appropriate. Avoid overusing the phrase, and vary your language with synonyms to maintain reader engagement.
Common error
Avoid using "less than certain" in situations that require definitive statements or guarantees. The phrase implies a degree of doubt, which can undermine the credibility of your claim if certainty is expected.
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "less than certain" functions as an adjective phrase modifying a noun, indicating a state of uncertainty or doubt. As Ludwig AI confirms, this phrase is grammatically correct and readily usable in various contexts.
Frequent in
News & Media
45%
Science
30%
Encyclopedias
10%
Less common in
Formal & Business
5%
Social Media
5%
Wiki
5%
Ludwig's WRAP-UP
In summary, "less than certain" is a versatile phrase used to express doubt or a lack of confidence. Ludwig AI validates its grammatical correctness and widespread use across various domains, including news, science, and encyclopedias. When using "less than certain", it's important to consider the context and avoid overusing it or combining it with absolute statements. Alternatives such as "somewhat uncertain" or "not entirely sure" can offer nuanced ways to convey similar meanings. Remember, effectively communicating uncertainty is key to maintaining credibility and fostering transparency in your writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
somewhat uncertain
Replaces "less than" with "somewhat", implying a slight degree of uncertainty.
not entirely sure
Uses a more direct and conversational tone to convey uncertainty.
open to doubt
Emphasizes the possibility of questioning or doubting the situation.
subject to doubt
Similar to "open to doubt", but slightly more formal.
not completely convinced
Highlights a lack of full belief or conviction.
questionable
A concise way to express that something is doubtful or uncertain.
dubious
Similar to "questionable", but often implies a stronger sense of skepticism.
unpredictable
Focuses on the inability to foresee a definite outcome.
tenuous
Implies a weak or fragile basis, leading to uncertainty.
up in the air
An informal idiom indicating that the outcome is still undecided or uncertain.
FAQs
How can I use "less than certain" in a sentence?
Use "less than certain" to express doubt or a lack of confidence about a future outcome or current situation. For example: "The success of the project is "less than certain" due to budget constraints."
What are some alternatives to saying "less than certain"?
You can use phrases like "somewhat uncertain", "not entirely sure", or "open to doubt" depending on the nuance you want to convey.
Is it appropriate to use "less than certain" in formal writing?
Yes, "less than certain" is appropriate for formal writing, particularly when expressing a degree of professional skepticism or acknowledging potential risks. However, ensure the overall tone remains objective and avoids excessive hedging.
What is the difference between "less than certain" and "unlikely"?
"Less than certain" suggests doubt or a lack of complete confidence, while "unlikely" implies a lower probability of occurrence. "Less than certain" is a milder expression of doubt than "unlikely".
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
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested