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Adjective: dateless  deyt-lus
  1. Having no known beginning and presumably no end
    "the dateless rise and fall of the tides";
    - endless, sempiternal
  2. Of such great duration as to preclude the possibility of being assigned a date
    "dateless customs"
  3. Not bearing a date
    "a dateless letter";
    - undated
  4. Unaffected by time
    "few characters are so dateless as Hamlet";
    - timeless

See also: infinite, unaltered, unchanged, undatable