The word "imperishably" means something that lasts forever or cannot be destroyed. Some synonyms for imperishably are enduringly, indestructibly, eternally, incessantly, perennially, persistently, perpetually, unfadingly, and undyingly. The words enduringly and indestructibly both suggest something that is strong enough to withstand any challenge or circumstance. Eternally and perpetually suggest something that will last forever without any end. Words like incessantly and persistently suggest something that will continue indefinitely without any interruption. Perennially and unfadingly suggest something that will last forever without ever losing its worth or value. Finally, undyingly suggests something that will live on even after death.