The Collaborative International Dictionary
Syntactically
Syntactic \Syn*tac"tic\, Syntactical \Syn*tac"tic*al\, a. [Cf. G. ? putting together. See Syntax.] Of or pertaining to syntax; according to the rules of syntax, or construction. -- Syn*tac"tic*al*ly, adv.
Wiktionary
syntactically
adv. according to the rules of syntax
WordNet
syntactically
adv. with respect to syntax; "syntactically ill-formed"
Usage examples of "syntactically".
So many of the most respected books of the last hundred years are so forbiddingly esoteric, syntactically dense, and formally complex, that they seem accessible only to the most dedicated and initiated readers.