Adverbial(a.) Of or pertaining to an adverb; of the nature of an adverb; as, an adverbial phrase or form.
Adverbiality(n.) The quality of being adverbial.
Adverbialize(v. t.) To give the force or form of an adverb to.
Adverbially(adv.) In the manner of an adverb.

Words within adverbially