Wiktionary
nonrestrictive
a. not restrictive; not imposing restrictions
WordNet
nonrestrictive
adj. not limiting the reference of a modified word or phrase; "the nonrestrictive clause in `I always buy his books, which have influenced me greatly,' refers to his books generally and adds an additional fact about them"
Usage examples of "nonrestrictive".
Once the Posleen are on the plains, in nonrestrictive terrain, our armored columns and artillery will eat them alive.