dateless vs unchanged

dateless and unchanged both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dateless	No	Yes	No	No
unchanged	No	Yes	No	No

dateless (adjective)	unchanged (adjective)
having no known beginning and presumably no end	not made or become different
unaffected by time	remaining in an original state
not bearing a date
of such great duration as to preclude the possibility of being assigned a date