indestructible Synonyms

perdurable undestroyable durable perpetual permanent perennial well fortified lasting invulnerable inviolable invincible inextirpable inextinguishable secure strong timeless shatterproof unassailable unbreakable long-lasting unfading never-ending unending unceasing undying tough ineradicable ineffaceable indissoluble eterne enduring endless dura deathless dateless constant changeless ceaseless ageless adamantine eternal everlasting indelible incorruptible impregnable imperishable impenetrable immutable immortal flinty