Definitions of unregistered:

• adjective:   not registered

  Example: "An unregistered citizen"

• adjective:   (of animals) not recorded with or certified by an official breed association

  Example: "Unregistered dairy cattle"

• adjective:   (a boat or vessel) not furnished with official documents
• adjective:   not filed or recorded in the place prescribed by law

  Example: "An unregistered trademark"