Unregistered
Part of speech: adjective
Definition: Not registered
Undocumented
Part of speech: adjective
Definition: not having the documents to support a claimnot having official documentation required to enter, live or work in a country
Example sentence: The story of undocumented immigrants in this country is not just about undocumented immigrants. It's about the country as a whole, and it's about us being able to tell the truth about where we are with this issue because we haven't been telling the truth about where we are with this issue.