'Unregistered' definitions:

Definition of 'unregistered'

(from WordNet)
adjective
(of animals) not recorded with or certified by an official breed association; "unregistered dairy cattle" [ant: registered]
adjective
Not registered; "an unregistered citizen" [ant: registered]
adjective
(a boat or vessel) not furnished with official documents

Definition of 'Unregistered'

From: GCIDE