date·less /ˈdetləs/
 (a.)無日期的;無限期的


 date·less, a.
 1. Without date; having no fixed time.

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 dateless
      adj 1: having no known beginning and presumably no end; "the
             dateless rise and fall of the tides"; "time is
             endless"; "sempiternal truth" [syn: 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" [syn: undated]
      4: unaffected by time; "few characters are so dateless as
         Hamlet"; "Helen's timeless beauty" [syn: timeless]