a word that adds more information about place, time, manner, cause, or degree to a verb, an adjective, a phrase, or another adverb In “speak kindly,” “incredibly deep,” “just in time,” and “too quickly,” “kindly,” “incredibly,” “just,” and “too” are all adverbs. see sentence adverb
NAmE//ədˈvərbiəl//
adjective “Very quickly indeed” is an adverbial phrase.See adverb in the Oxford Advanced Learner's DictionaryCheck pronunciation: adverb