Synonyms and related words :
abiding, age-long, aged, amaranthine, ancient, antique, changeless, chronic, colorfast, constant, continuing, deathless, deep-dyed, diuturnal, double-dyed, durable, dyed-in-the-wool, embalmed, enduring, ever-fresh, evergreen, everlasting, fadeless, fast, firm, fixed, frozen, hardy, immobile, immortal, immutable, imperishable, incorruptible, indelible, ingrain, ingrained, intact, intransient, inveterate, inviolate, lasting, long-lasting, long-lived, long-standing, long-term, longeval, longevous, macrobiotic, never-dying, of long duration, of long standing, perdurable, perduring, perennial, permanent, perpetual, persistent, persisting, quiescent, remaining, rigid, sempervirent, solid, stable, static, stationary, staying, steadfast, sustained, torpid, tough, unaltered, unchangeable, unchanged, unchanging, unchecked, undestroyed, undying, unfailing, unshifting, unvaried, unvarying, vital