"dateless" in the adjective sense
1. dateless, endless, sempiternal
having no known beginning and presumably no end
"the dateless rise and fall of the tides"
"time is endless"
"sempiternal truth"
2. dateless
of such great duration as to preclude the possibility of being assigned a date
"dateless customs"
3. dateless, undated
not bearing a date
"a dateless letter"
4. dateless, timeless
unaffected by time
"few characters are so dateless as Hamlet"
"Helen's timeless beauty"
Source: WordNet® (An amazing lexical database of English)
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