aeonian aeonian /iːˈəʊnɪən/

adjective

1. Continuing forever or indefinitely  ( aeonian , ageless , eonian [ N. American] , eternal , everlasting , perpetual , unceasing , unending , eviternal [Archaic] )
   continuing forever or indefinitely
    The ageless themes of love and revenge
   the ageless themes of love and revenge
    Eternal truths
   eternal truths
    Life everlasting
   life everlasting
    Hell's perpetual fires
   hell's perpetual fires
    The unending bliss of heaven
   the unending bliss of heaven
   
2. Of or relating to a geological eon (longer than an era)  ( aeonian , eonian [ N. American] )
   of or relating to a geological eon (longer than an era)