Synonyms and related words :
abiding, accepted, accustomed, age-long, aged, ancient, antique, confirmed, constant, continuing, customary, deep-dyed, deep-fixed, deep-rooted, deep-seated, deep-set, deep-settled, diuturnal, durable, dyed-in-the-wool, enduring, established, evergreen, fast, fixed, habitual, habituated, hardened, hardy, immutable, implanted, incorrigible, inculcated, infixed, ingrained, instilled, intransient, inveterate, irreversible, lasting, lingering, long-established, long-lasting, long-lived, long-standing, long-term, longeval, longevous, macrobiotic, of long duration, of long standing, perdurable, perduring, perennial, permanent, perpetual, persistent, persisting, remaining, rooted, routine, sempervirent, set, settled, settled in habit, stable, staying, steadfast, thorough, tough, unfading, vital, wonted