undocumented
/ˌʌnˈdɒkjʊmentɪd/adjective
1
- not recorded in or proved by documents未登记的; 未注册的; 无证明文件的。
2
- N. Amer. not having the appropriate legal document or licence〈北美〉非法的; 无证的：
undocumented immigrants.
非法移民。