un·ac·cus·tomed 
/ˌʌnəˈkʌstəmd/ adjective
/ˌʌnəˈkʌstəmd/ adjective formal 1 : not usual or common : not customary
▪ They responded to our request with unaccustomed speed. 2 : not familiar with something so that it does not seem normal or usual : not used to something — + to ▪ Her pets are unaccustomed to travel/traveling. ▪ She was unaccustomed to fame.
▪ They responded to our request with unaccustomed speed.
