durable

durable adjective abiding, aeonian, ageless, ceaseless, changeless, chronic, constant, continuing, endless, enduring, established, eternal, everlasting, firm, firmus, fixed, hard, hardy, holding up well, immortal, immovable, immutable, imperishable, impervious to change, incessant, indeciduous, indelible, ineradicable, inerasable, inexhaustible, inexpungeable, intransmutable, invariable, inveterate, irremovable, lasting, lifelong, living, long-enduring, long-lasting, long-lived, long-standing, longevous, maintained, never-ending, not easily worn out, of long duration, of long standing, perdurable, permanent, perpetual, persevering, persistent, persisting, remaining, resistant, robust, rocklike, sempiternal, settled, solidus, sound, stabilis, stable, staying, steadfast, strong, sturdy, substantial, surviving, sustained, tenacious, timeless, tough, unaltered, unceasing, unchangeable, undying, unfading, unfailing, unintermitting, uninterrupted, unyielding, without end

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See also: constant, firm, immutable, indelible, indestructible, infrangible, noncancellable, permanent, persistent, resilient, solid, sound, stable, strong, unremitting