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
not clearly defined
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "not clearly defined" is correct and commonly used in written English.
It refers to something that is not well-defined or does not have a clear meaning. Example: The rules of the game were not clearly defined, causing confusion among the players.
✓ Grammatically correct
Science
News & Media
Formal & Business
Encyclopedias
Wiki
Alternative expressions(17)
poorly defined
ambiguous
vaguely defined
undefined
imprecise
unspecified
open to interpretation
not distinctly specified
not explicitly stated
insufficiently defined
not well-defined
not precisely determinable
difficult to pinpoint
subject to interpretation
without a precise meaning
no definite meaning
lacking a clear meaning
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
So it's not clearly defined.
News & Media
The limitations, however, are not clearly defined.
But net benefit is not clearly defined in the law.
News & Media
There are some benefits of getting involved in a movement that is not clearly defined.
News & Media
The volunteers have no enforcement powers; their duties are not clearly defined.
News & Media
However, the key organ/tissue driving the IF-induced metabolic benefits is not clearly defined.
Science & Research
THE role of the pituitary gland in liver regeneration following partial hepatectomy is not clearly defined.
Science & Research
In Colombia, its frequency and associated factors were not clearly defined.
Science
However, the functional domain of Ov-ASP-1 as an adjuvant is not clearly defined.
Science
The occurrence and mechanisms of nocturnal hypoxemia in precapillary pulmonary hypertension (PH) are not clearly defined.
Science
The population that benefits from or is harmed by the procedure is not clearly defined.
Science
Expert writing Tips
Best practice
When using "not clearly defined", specify what aspects lack clarity and why. This provides context and avoids ambiguity.
Common error
Avoid using "not clearly defined" without providing further explanation or context. Your audience may not be aware of the specific ambiguity you're addressing.
Source & Trust
80%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "not clearly defined" functions as an adjectival phrase, typically modifying a noun or noun phrase to indicate that its meaning or scope lacks precision. Ludwig AI confirms its correct grammatical usage.
Frequent in
Science
42%
News & Media
27%
Encyclopedias
10%
Less common in
Formal & Business
8%
Wiki
8%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "not clearly defined" is a common and grammatically sound way to express a lack of clarity or precision. As Ludwig AI confirms, it's frequently used across various domains, including science, news, and general discourse. The key to using this phrase effectively is to provide context. Rather than simply stating that something is "not clearly defined", explain why it lacks clarity and what aspects are ambiguous. Consider using alternatives like "poorly defined" or "ambiguous" to further refine your meaning. By providing specific details and context, you ensure that your audience understands the nature and implications of the lack of definition.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
poorly defined
Emphasizes the inadequacy of the definition.
vaguely defined
Highlights the ambiguity or lack of precision in the definition.
ambiguous
Focuses on the multiple possible interpretations.
ill-defined
Stresses the lack of proper definition.
undefined
Indicates a complete absence of definition.
imprecise
Highlights a lack of exactness or accuracy.
nebulous
Suggests a hazy or indistinct quality.
unspecified
Emphasizes that details have not been determined or stated.
lacks clarity
Directly points out the absence of clear understanding.
open to interpretation
Highlights the subjective nature and potential for varied understandings.
FAQs
What does "not clearly defined" mean?
The phrase "not clearly defined" means that something lacks a precise or distinct explanation, making it open to interpretation or causing confusion.
How can I use "not clearly defined" in a sentence?
You can use "not clearly defined" to describe concepts, rules, roles, or boundaries that lack specific details. For example: "The scope of the project was "poorly defined", leading to scope creep."
What are some alternatives to "not clearly defined"?
Alternatives include "ambiguous", "vaguely defined", "ill-defined", and "lacks clarity". The best choice depends on the specific nuance you want to convey.
Is it better to say "poorly defined" or "not clearly defined"?
Both "poorly defined" and "not clearly defined" are acceptable. "Poorly defined" suggests a substandard definition, while "not clearly defined" simply indicates a lack of clarity. Choose the phrase that best fits 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
80%
Authority and reliability
4.5/5
Expert rating
Real-world application tested