undatable vs dateless

undatable and dateless both are adjectives.

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

undatable (adjective)	dateless (adjective)
not capable of being given a date	having no known beginning and presumably no end
	unaffected by time
	not bearing a date
	of such great duration as to preclude the possibility of being assigned a date