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Discover LudwigThe word "nonadaptive" is correct and usable in written English
It is typically used in contexts related to biology, psychology, or systems theory to describe traits or behaviors that do not change in response to environmental demands. Example: "The species exhibited nonadaptive traits that hindered its survival in changing climates."
Dictionary
nonadaptive
adjective
Not adaptive; unable to adapt.
synonyms
Exact(5)
A classic example of a supposedly nonadaptive Bauplän is the four-limbedness of vertebrates.
"WE ARE A CANCER ON THE PLANET!" he declares at one point, in a rant that goes viral on the Internet as his dream sours into a nightmare vision of a land in which "the winners," who own the future, trample over "the dead and dying and forgotten, the endangered species of the world, the nonadaptive".
Later on, there is half a chapter on "exaptation" -- the idea that currently adaptive features of organisms may have originated as nonadaptive ancestral features.
This means that the presence of group selection or the effectiveness of group selection is to be measured by the existence of nonadaptive behavior on the part of individual organisms along with the presence of a corresponding group-level adaptation.
Nonadaptive immune responses rely on a number of chemical signals, collectively called cytokines, to carry out their effects.
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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