undocumented

adjective

not documented: such as a) not supported by documentary evidence b) lacking documents required for legal immigration or residence

Wiktionary

adj

Etymology: Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English documented English undocumented From un- + documented.

Lacking instructions or reference material.
“Undocumented software can be very difficult to learn to use.”
Not having official documents that provide identification, authorization, etc.
“On arrival from a foreign port, undocumented foreign-built vessels, if laden with goods, wares or merchandise, may, with their cargoes, be subject to forfeiture.”
Not having official documents that provide identification, authorization, etc.
“undocumented immigrant”
“One day after class I was talking to them about college, and one of my top students raised his hand and said he wasn’t sure he could go because he’s undocumented. He didn’t know if they’d let him in.”

noun

Synonym of undocumented immigrant.
“Although the first generation is likely to have greater fluency than the undocumenteds, the controversy over bilingual education attests to the persistence of language difficulties.”