undocumented

US /ʌnˈdɑː.kjə.men.t̬ɪd/
UK /ʌnˈdɑː.kjə.men.t̬ɪd/
1.

không có giấy tờ

not supported by written proof:

:
•
People should not stop eating fish because of some undocumented risk of cancer.