dateless

Adjective

• unaffected by time
  • few characters are so dateless as Hamlet
    
  • Helen's timeless beauty
    

• not bearing a date
  • a dateless letter
    

• of such great duration as to preclude the possibility of being assigned a date
  • dateless customs
    

• having no known beginning and presumably no end
  • the dateless rise and fall of the tides
    
  • time is endless
    
  • sempiternal truth
    

Related words

• Synonyms: 
  timeless , undated , endless , sempiternal