undocumented
adj.adj. describing someone who lives in a country without the official legal papers required to stay there. It can also mean something that has not been recorded in writing.
adj. lacking the required legal documents for immigration or residence; alternatively, not recorded or proven by written evidence. Often used attributively before a noun.
The charity provides medical care for undocumented families.
Many undocumented workers contribute to the local economy despite lacking formal work permits or residency papers.
While the historian found plenty of official records, the daily lives of the common people remained largely undocumented, leaving a significant gap in the narrative of the era.
From un- + documented.
Typically precedes the noun it modifies; in a legal context, it is often preferred over more pejorative terms.