unforgettable vs persistent

unforgettable and persistent both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unforgettable	No	Yes	No	No
persistent	No	Yes	No	No

unforgettable (adjective)	persistent (adjective)
impossible to forget	retained; not shed
	never-ceasing
	stubbornly unyielding
	continually recurring to the mind