syntactical

Data that are not shared in this manner—say, the exact position of eyes or syntactical rules that make up a well-formulated sentence—can influence behavior, but nonconsciously.

From Scientific American ● Sep. 8, 2023

Oliver Wendell Holmes, who characterized Theodore Roosevelt’s Bull Moose movement as one of “strenuous vagueness,” survived Antietam but might have expired straining to decipher Tuesday’s cascade of falsehoods, rudeness and syntactical tangles.

From Washington Post ● Sep. 30, 2020

First, seemingly thrown by syntactical complexity, it suggests that I should replace “there in a” with “there is a,” a change that would be ungrammatical, but that still leaves me questioning my own stylistic choices.

From Slate ● Feb. 7, 2018

By reading the material aloud, Horgan and her writing partners are trying to make the lines sound as much like spoken English as possible; “Catastrophe” scripts are littered with syntactical detritus like “you know.”

From The New Yorker ● Apr. 25, 2016

And learners were not only dissuaded, but strictly forbidden to go beyond the limits set them in the etymological and syntactical rules of the authors to whom they were referred.

From Lectures on Language As Particularly Connected with English Grammar. by William Stevens Balch