sempiternal Synonyms

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