Main entry: timeless, dateless
Definition: unaffected by time
Usage: few characters are so dateless as Hamlet; Helen's timeless beauty
Definition: not bearing a date
Usage: a dateless letter
Main entry: dateless
Definition: of such great duration as to preclude the possibility of being assigned a date
Usage: dateless customs
Main entry: endless, dateless, sempiternal
Definition: having no known beginning and presumably no end
Usage: the dateless rise and fall of the tides; time is endless; sempiternal truth