unregistered
🇺🇸
/ˌʌnˈredʒɪstərd/
🇬🇧
/ˌʌnˈredʒɪstəd/
Something that is not officially recorded or listed.
The unregistered vehicle was pulled over by the police for inspection.
这辆未注册的车辆被警察拦下检查。