unaccustomed
US /ˌʌn.əˈkʌs.təmd/
UK /ˌʌn.əˈkʌs.təmd/

1.
inusual, poco común
not familiar or usual; out of the ordinary
:
•
He felt an unaccustomed sense of peace.
Sintió una sensación de paz inusual.
•
It was an unaccustomed sight to see him so quiet.
Era una vista inusual verlo tan callado.
2.
desacostumbrado a, no acostumbrado a
not used to something; not in the habit of
:
•
She was unaccustomed to such luxury.
Ella no estaba acostumbrada a tanto lujo.
•
He found himself unaccustomed to the cold weather.
Se encontró desacostumbrado al clima frío.