Inveterate

a.	1.
	1.	Old; long-established. It is an inveterate and received opinion. - Bacon.
	2.	Firmly established by long continuance; obstinate; deep-rooted; of long standing; as, an inveterate disease; an inveterate abuse. Heal the inveterate canker of one wound. - Shak.
	3.	Having habits fixed by long continuance; confirmed; habitual; as, an inveterate idler or smoker.
	4.	Malignant; virulent; spiteful.
v. t.	1.	To fix and settle by long continuance.

Adj.

1.

inveterate - having a habit of long standing; "a chronic smoker" Synonyms: chronic, confirmed, habitual

abiding, accustomed, acknowledged, addicted, admitted, age-long, aged, ancient, antique, chronic, confirmed, constant, continuing, conventional, customary, deep-dyed, deep-engraven, deep-fixed, deep-grounded, deep-laid, deep-rooted, deep-seated, deep-set, deep-settled, diuturnal, durable, dyed-in-the-wool, embedded, embossed, enduring, engrafted, engraved, entrenched, established, etched, evergreen, fast, firmly established, fixed, folk, graven, habitual, habituated, hallowed, handed down, hardened, hardy, heroic, hoary, immemorial, immutable, implanted, impressed, imprinted, inbred, incorrigible, inculcated, indelibly impressed, indurated, infixed, ingrained, ingrown, innate, instilled, intransient, inwrought, irreversible, lasting, legendary, lifelong, long-established, long-lasting, long-lived, long-standing, long-term, longeval, longevous, macrobiotic, mythological, of long duration, of long standing, of the folk, old, old-line, on a rock, on bedrock, oral, perdurable, perduring, perennial, permanent, perpetual, persistent, persisting, prescriptive, received, recognized, remaining, rooted, sempervirent, set, settled, settled in habit, stabilized, stable, staying, steadfast, sworn, thorough, time-honored, tough, traditional, tried and true, true-blue, understood, unfading, unwritten, usual, venerable, vested, vital, well-established, well-founded, well-grounded, well-set, well-settled, worshipful