be unaccustomed to doing sth
1unaccustomed — un|ac|cus|tomed [ˌʌnəˈkʌstəmd] adj formal 1.) unaccustomed to (doing) sth not used to something ▪ a country boy, unaccustomed to city ways 2.) [only before noun] not usual, typical, or familiar ▪ She was completely exhausted by the unaccustomed… …
