ad·ver·bi·al /ædˈvɝbiəl/
(a.)副詞的
Ad·ver·bi·al a. Of or pertaining to an adverb; of the nature of an adverb; as, an adverbial phrase or form.
◄ ►
adverbial
adj : of or relating to or functioning as an adverb; "adverbial
syntax"
n : a word or group of words function as an adverb