a.
1.
Undying, deathless, ever-living, imperishable, incorruptible, unfading, indestructible, indissoluble, never-dying.
2.
Eternal, everlasting, endless, perpetual, ceaseless, never-ending.
3.
[ By hyperbole .] Lasting, enduring, permanent, abiding, lasting through all time or as long as the world endures.