/ ˌʌnəˈkʌstəmd; NAmE / adjective ( formal )
1.
unaccustomed to sth / to doing sth not in the habit of doing sth; not used to sth :
He was unaccustomed to hard work.
I am unaccustomed to being told what to do.
2.
[ usually before noun ] not usual, normal or familiar :
The unaccustomed heat made him weary.
OPP accustomed