Definitions

1. adjective

chronically habitual or addicted to something, such as a habit or behavior

“She had an inveterate habit of biting her nails when nervous.”

2. noun

a person or thing that is characterized by such a habit or addiction

“The inveterate smoker had to quit for his health.”

3. adverb

frequently or persistently

“She had been to the movies inveterately since her childhood.”