Inveterate

1. Firmly established by long continuance; obstinate; deep-rooted; of long standing; as, an inveterate disease; an inveterate abuse.
2. Old; long-established.
3. Having habits fixed by long continuance; confirmed; habitual; as, an inveterate idler or smoker.
4. Malignant; virulent; spiteful.
5. To fix and settle by long continuance.