sempiternal Synonyms

endless dateless eternal perdurable timeless steady interminable relentless persistent lasting permanent perennial perpetual undying unremitting not decaying non-corroding without end non-stop long-lasting unfading never-ending unending unceasing uninterrupted infinite inextinguishable durable deathless continuous continuing continual constant coeternal ceaseless boundless abiding enduring everlasting indissoluble indestructible indefinite incessant imperishable immutable immortal immemorial forever ageless