sempiternal vs dateless

sempiternal and dateless both are adjectives.

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

As adjectives, sempiternal and dateless are synonyms defined as:

sempiternal and dateless: having no known beginning and presumably no end

Other synonyms of sempiternal include endless.

sempiternal (adjective)	dateless (adjective)
having no known beginning and presumably no end	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