authoritative vs important

authoritative and important both are adjectives.

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

As adjectives, authoritative and important are synonyms defined as:

authoritative and important: having authority or ascendancy or influence

authoritative (adjective)	important (adjective)
endowed with authority	of great significance or value
having authority or ascendancy or influence	of extreme importance; vital to the resolution of a crisis
of recognized authority or excellence	important in effect or meaning
	having or suggesting a consciousness of high position
	having authority or ascendancy or influence