unforgettable vs haunting

unforgettable and haunting both are adjectives.

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

unforgettable (adjective)	haunting (adjective)
impossible to forget	having a deeply disquieting or disturbing effect
	continually recurring to the mind