unpaid vs outstanding

unpaid and outstanding both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unpaid	No	Yes	No	No
outstanding	No	Yes	No	No

unpaid (adjective)	outstanding (adjective)
not paid	having a quality that thrusts itself into attention
engaged in as a pastime	of major significance or importance
without payment	distinguished from others in excellence
	owed as a debt