decisive vs decide

decisive is an adjective but decide is not an adjective.

Word	Noun	Adjective	Verb	Adverb
decisive	No	Yes	No	No
decide	No	No	Yes	No

decisive (adjective)	decide (adjective)
determining or having the power to determine an outcome
characterized by decision and firmness
forming or having the nature of a turning point or crisis
unmistakable

decisive (verb)	decide (verb)
	reach, make, or come to a decision about something
	bring to an end; settle conclusively
	cause to decide
	influence or determine