Unaccustomed, a.
1. Not used; not habituated; unfamiliar; unused; -- which to. Chastened as a bullock unaccustomed to yoke. Jer. xxxi. 18.
2. Not usual; uncommon; strange; new. What unaccustomed cause procures her hither Shak.
Shades of meaning
Fernald lists unaccustomed only as an antonym, under addicted.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given