Synonyms for eternal

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1. Without pause

   endless, interminable, continual, unbroken, continuous, continued, unceasing, incessant, ceaseless, constant, unending, enduring, persistent, always, relentless, uninterrupted, unremitting; see also perpetual 1.

   Antonyms changeable*, inconstant, fluctuating.

2. Without end

   everlasting, unending, endless, perpetual, never-ending, termless, infinite, indefinite, permanent, ageless, boundless, timeless, immortal, deathless, undying, forever, interminable, indeterminable, dateless, immeasurable, unfading, indestructible, always, limitless, imperishable, illimitable, indomitable, unconquerable, unyielding, eonian, sempiternal, to one's dying day, till doomsday, for ever and a day, for ever and ever; see also perpetual 1.

   Antonyms finite, temporary*, ending. See syn. study at perpetual.perpetual.