perdurable Synonyms

indestructible durable undestroyable persistent persisting perpetual permanent perennial long-lived lifelong lasting infinite prolonged sempiternal stable long-standing long-term long-lasting unfading never-ending unending unceasing undying timeless standing inextinguishable ineradicable endless diuturnal deathless dateless continuous continuing continual constant chronic ageless enduring eternal everlasting indissoluble indelible indefinite incorruptible incessant imperishable immutable immortal fixed firm