- perdurable
- adjpermanent, eternal, Literary. sempiternal, immortal, undying, deathless, imperishable, indestructible, indissoluble, unfading, everlasting, amaranthine, perennial; enduring, standing the test of time, going on and on, long-lived, life-long, long-standing; abiding, continuing, persisting; perpetual, unending, endless, never-ending, ceaseless, unceasing, incessant, unremitting; constant, durable, steady, stable, solid, like the Rock of Gibraltar, fixed, firm, steadfast; immutable, unchangeable, changeless, unalterable, invariable; established, deep-rooted, strong, entrenched; surviving through thick and thin or for better or for worse.
A Note on the Style of the synonym finder. 2014.