abiding, ageless, ceaseless, changeless, chronic, confirmed, constant, continued, continuing, dateless, deep-seated, durable, endless, enduring, engrafted, entrenched, established, eternal, everlasting, fast, fixed, immortal, immutable, imperishable, incommutable, indefatigable, indefeasible, indelible, indestructible, ineradicable, inextinguishable, infinite, ingrained, insusceptible to change, interminable, intransient, intransmutable, invulnerable, irremovable, irreversible, irrevocable, lasting, long-lasting, never-ceasing, never-ending, never-stopping, nonreversible, perdurable, perduring, perennial, perennis, perpetual, perpetuated, persevering, persistent, persisting, preserved, radicated, remaining, reverseless, rooted, secure, sempiternal, set, stabilis, stable, static, stationary, staying, steadfast, steady, surviving, sustained, tenacious, unalterable, unceasing, unchangeable, unchanging, unchecked, undestroyable, undying, unending, unerasable, unfading, unfailing, unflagging, uninterrupted, unmodifiable, unmovable, unrepealable, unshifting, unvarying, unwavering, unyielding, without end
chronic, constant, continual (perpetual), conventional, durable, fixed (securely placed), fixed (settled), immutable, indefeasible, indelible, indestructible, infinite, ingrained, irreversible, irrevocable, last (final), noncancellable, perpetual, stable, standing, static, unalterable
Burton's Legal Thesaurus. William C. Burton. 2006
adj.Fixed; continuing or lasting without interruption; intended to stay in the same place or the same condition indefinitely.
The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. Amy Hackney Blackwell. 2008.