adjective
1.
firmly established or having something firmly established
the inveterate tendency to overlook the obvious
Synonyms: bred-in-the-bone, confirmed, deep-dyed, deep-rooted, deep-seated, dyed-in-the-wool, entrenched, hard-shell, irradicable, settled, sworn
Related Word: accustomed, addicted, chronic, habituated; customary, habitual, usual; hardened, indurated; established, fixed, set; inbred, innate; abiding, enduring, persistent, persisting
2.
Synonyms: old 2, continuing, enduring, lifelong, long-lasting, long-lived, perennial