of or relating to a geological eon (longer than an era)
ageless, aeonian, eonian, eternal, everlasting, perpetual, unending, unceasing(adj)
continuing forever or indefinitely
"the ageless themes of love and revenge"; "eternal truths"; "life everlasting"; "hell's perpetual fires"; "the unending bliss of heaven"
everlasting, eonian, sodding(a), utter(a), thoroughgoing(a), double-dyed(a), interminable, complete(a), ageless, unceasing, staring(a), unremitting, gross(a), incessant, unending, arrant(a), stark(a), ceaseless, consummate(a), pure(a), everlasting(a), unadulterated, constant, perpetual, aeonian, perfect(a), never-ending, endless, eternal
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