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Exact(7)
It appears to be impossible to define anastomosing rivers unambiguously on the basis of channel planform only.
The wording was apparently changed after parliamentary drafters objected that a proposed new offence of condoning terrorism would be impossible to define.
Great literature may be impossible to define, and of the making of Homers there may be no end.
For multidimensional systems it may even be impossible to define a potential function, but the general dependence on σ2 is still of the type ∼exp(K/σ2) [14], [14].
Understanding the cause of PD may indeed be impossible to define.
However, it appeared to be impossible to define the roughness of the new surface structures accurately, because of the three dimensional character of the new surface structures.
Similar(53)
"Taste is impossible to define, but his is absolute perfection.
It is impossible to define completely what constitutes academic dishonesty.
— that right at the start is impossible to define precisely.
Beason conceded that the phrase is "impossible" to define.
"The characters resist him; they are not easy to live with; they are impossible to define.
More suggestions(19)
be impossible to establish
be impossible to identify
be unable to define
become impossible to define
be afraid to define
becomes impossible to define
be helpful to define
be sure to define
be hard to define
be useful to define
be convenient to define
be difficult to define
be tricky to define
be essential to define
be impossible to argue
be impossible to close
be impossible to pass
be impossible to forget
be impossible to know
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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