eternal eternal /iːˈtɝːnəl/

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. () Tiresomely long; seemingly without end  ( eternal , interminable , endless )
   tiresomely long; seemingly without end
    Endless debates
   endless debates
    An endless conversation
   an endless conversation
    The wait seemed eternal
   the wait seemed eternal
    Eternal quarreling
   eternal quarreling
    An interminable sermon
   an interminable sermon