outstanding vs unpaid

outstanding and unpaid both are adjectives.

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

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