Synonyms:
- ageless,
- ceaseless,
- changeless,
- coeternal,
- constant,
- continual,
- continuous,
- dateless,
- deathless,
- durable,
- endless,
- enduring,
- eternal,
- eterne,
- ever-being,
- ever-durable,
- ever-during,
- everlasting,
- everliving,
- fixed,
- immemorial,
- immortal,
- immutable,
- imperishable,
- impregnable,
- incessant,
- incorruptible,
- indelible,
- ineffaceable,
- ineradicable,
- inexpugnable,
- inextinguishable,
- infinite,
- interminable,
- invincible,
- invulnerable,
- irrefragable,
- lasting,
- long-lasting,
- never-ceasing,
- never-ending,
- nonperishable,
- nonstop,
- nonterminating,
- nonterminous,
- olamic,
- perdurable,
- perennial,
- permanent,
- perpetual,
- quenchless,
- sempiternal,
- steady,
- timeless,
- unalterable,
- unbreakable,
- unceasing,
- unchangeable,
- unchanging,
- undampable,
- undestroyable,
- undying,
- unending,
- unintermitting,
- uninterrupted,
- unquenchable,
- unremitting,
- without end