adverb
ad•verbBrE /ˈædvɜːb/
NAmE /ˈædvɜːrb/
noun(grammar)a word that adds more information about place, time, manner, cause or degree to a verb, an adjective, a phrase or another adverb
word origin
In ‘speak kindly’, ‘incredibly deep’, ‘just in time’ and ‘too quickly’, ‘kindly’, ‘incredibly’, ‘just’ and ‘too’ are all adverbs. 
see also sentence adverb 
ad•ver•bial /BrE ædˈvɜːbiəl; NAmE ædˈvɜːrbiəl/ adjective‘Very quickly indeed’ is an adverbial phrase.
