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