untarnished vs unstained

untarnished and unstained both are adjectives.

Word	Noun	Adjective	Verb	Adverb
untarnished	No	Yes	No	No
unstained	No	Yes	No	No

As adjectives, untarnished and unstained are synonyms defined as:

Other synonyms of untarnished include stainless, unsullied, untainted.

untarnished (adjective)	unstained (adjective)
(of reputation) free from blemishes	not stained
	without soil or spot or stain
	(of reputation) free from blemishes
	not having a coating of stain or varnish