authoritatively vs authoritative

authoritatively is not an adjective while authoritative is an adjective.

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

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

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