unaccustomedEnglishOxford New American Dictionaryunaccustomed /ˌənəˈkəstəmd, ˌənəˈkəstəmd / ▸ adjective not familiar or usual; out of the ordinary: they finished their supper with unaccustomed speed. ▪ [predicative] (unaccustomed to) not familiar with or used to: the visitors were unaccustomed to country roads. – DERIVATIVES unaccustomedly