Main entry: interminable, eternal, endless
Definition: tiresomely long; seemingly without end
Usage: endless debates; an endless conversation; the wait seemed eternal; eternal quarreling; an interminable sermon
Main entry: eonian, eternal, everlasting, aeonian, ageless, perpetual, unceasing, unending
Definition: continuing forever or indefinitely
Usage: the ageless themes of love and revenge; eternal truths; life everlasting; hell's perpetual fires; the unending bliss of heaven