undated

adjective
🔊/ˌʌnˈdeɪtɪd/
🔊/ˌʌnˈdeɪtɪd/
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  1. without a date written or printed on it未注日期的
    • an undated letter一封没写日期的信
  2. of which the date is not known日期不明的;时间不详的
    • undated archaeological remains时间未确定的考古遗迹
  3. compare dated