undocumented

un·doc·u·ment·ed

adjective \ən-ˈdä-kyə-ˌmen-təd\

: not having the official documents that are needed to enter, live in, or work in a country legally

: not supported by evidence that consists of documents : not having written proof

Full Definition of UNDOCUMENTED

:  not documented: as

a :  not supported by documentary evidence <undocumented expenditures>

b :  lacking documents required for legal immigration or residence <undocumented workers>

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Examples of UNDOCUMENTED

1. The company cannot reimburse you for undocumented travel expenses.

First Known Use of UNDOCUMENTED

1867