sempiternal

1. The dateless rise and fall of the tides; time is endless; sempiternal truth.
   永恒的潮起潮落；时间是无穷的；永恒的真理。

adj

1. having no known beginning and presumably no end
   1. the dateless rise and fall of the tides
   2. time is endless
   3. sempiternal truth

   Synonym:    datelessendless