Definition of dateless (adjective)
- having no known beginning and presumably no end
- of such great duration as to preclude the possibility of being assigned a date
- "dateless customs"
- not bearing a date
- "a dateless letter"
- synonyms: undated
- unaffected by time
- "few characters are so dateless as Hamlet"; "Helen's timeless beauty"
- synonyms: timeless
Source: Princeton University Wordnet