unaccustomedEnglishOxford Dictionary of Englishunaccustomed /ˌʌnəˈkʌstəmd / ▸ adjective not familiar or usual; out of the ordinary: they finished their supper with unaccustomed speed. ▪ (unaccustomed to) not familiar with or used to: the visitors were unaccustomed to country roads. – DERIVATIVES unaccustomedly adverb