authoritative vs authoritatively

authoritative is an adjective but authoritatively is not an adjective.

Word	Noun	Adjective	Verb	Adverb
authoritative	No	Yes	No	No
authoritatively	No	No	No	Yes

authoritative (adjective)	authoritatively (adjective)
endowed with authority
having authority or ascendancy or influence
of recognized authority or excellence

authoritative (adverb)	authoritatively (adverb)
	in an authoritative and magisterial manner