Inveteracy

n.	1.	Firm establishment by long continuance; firmness or deep-rooted obstinacy of any quality or state acquired by time; as, the inveteracy of custom, habit, or disease; - usually in a bad sense; as, the inveteracy of prejudice or of error. An inveteracy of evil habits that will prompt him to contract more. - A. Tucker.
	2.	Malignity; spitefulness; virulency. The rancor of pamphlets, the inveteracy of epigrams, and the mortification of lampoons. - Guardian.

abidingness, aboriginality, accustomedness, age, ancien regime, ancientness, antiquity, atavism, changelessness, cobwebs of antiquity, commonness, confirmation, confirmedness, constancy, customariness, deep-rootedness, deep-seatedness, durability, durableness, duration, dust of ages, eld, elderliness, eldership, embedment, endurance, entrenchment, establishment, firmness, fixation, fixedness, fixity, fixture, frozenness, great age, habitualness, hardening, hoary age, hoary eld, immobility, immovability, immovableness, immutability, implantation, infixion, invariability, invariableness, inveterateness, lastingness, long standing, old age, old order, old style, oldness, permanence, permanency, perpetualness, persistence, persistency, prevalence, primitiveness, primogeniture, primordialism, primordiality, quiescence, rigidity, senility, seniority, settledness, solidity, stability, stabilization, standing, stasis, steadfastness, torpor, unchangeability, unchangingness, venerableness, wontedness