Antonym of INVETERATE

Inveterate : having a particular habit, activity, or interest that is long-established and unlikely to change.
Stupid : having or showing a great lack of intelligence or common sense.
Uneducated : having or showing a poor level of education.
Ignorant : lacking knowledge or awareness in general; uneducated or unsophisticated.
Inexperienced : having little knowledge or experience of a particular thing.

Antonym of Inveterate is Inexperienced