Quick definitions from WordNet (unregistered)
▸ adjective: not registered ("An unregistered citizen")
▸ adjective: (of animals) not recorded with or certified by an official breed association ("Unregistered dairy cattle")
▸ adjective: (a boat or vessel) not furnished with official documents
▸ adjective: not filed or recorded in the place prescribed by law ("An unregistered trademark")
▸ adjective: not registered ("An unregistered citizen")
▸ adjective: (of animals) not recorded with or certified by an official breed association ("Unregistered dairy cattle")
▸ adjective: (a boat or vessel) not furnished with official documents
▸ adjective: not filed or recorded in the place prescribed by law ("An unregistered trademark")