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Discover LudwigThe phrase "is ill defined" is correct and usable in written English.
It can be used when discussing concepts, terms, or ideas that lack clarity or precision.
Example: "The term 'success' is ill defined in the context of personal achievement."
Alternatives: "is poorly defined" or "is vague."
Exact(22)
It is ill defined at best, hypocritical at worst.
The instruments' place in museums too is ill defined.
Determining candidacy even years post-SCI is ill defined and deserves investigation.
Since 9/11 my childhood fear has returned, but it is ill defined, along with the enemy.
However, the SE cannot be used for rough energy landscapes, where the continuum limit is ill defined.
His commission's authority is ill defined, it has no building and, as a body, has yet to meet.
Similar(38)
Equation (5) is ill-defined for.
Wave D is ill-defined and appears at pH > 9.0.
But presidential leaders leave some Britons feeling uneasy, especially when their mandate is ill-defined.
The term "sanctuary cities" is ill-defined and takes different forms in different places.
Where the territory is ill-defined, he held, 'difference of opinion is premature'.
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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