RhymeZone: inveterate definitions

Definitions of inveterate:

adjective: firmly established from having been around for a long time; of long standing
adjective: (of a person) Having had a habit for a long time
adjective: Malignant; virulent; spiteful.
verb: (obsolete) To fix and settle after a long time; to entrench.

(Definitions from Wiktionary)