For a long time.

inveteracy

firmly established from having been around for a long time; of long standing / (of a person) Having had a habit for a long time / Malignant; virulent; spiteful.

(obsolete) To fix and settle after a long time; to entrench.

(medicine, of an injury or condition) No longer fresh or recent.

simple past tense and past participle of inveterate

Third-person singular simple present indicative form of inveterate

The act of making inveterate.

present participle of inveterate