Here's what rhymes with unregistered.

Consider these alternatives

illegal / legal unaffiliated / dated registration / operation registered / unregistered registering / enregistering illegally / legally unregulated / related unapproved / used undocumented / nondocumented illicit / visit possess / less confiscated / stated registrations / relations intermediaries / varies ineligible / veritable proselytizing / rising intermediary / mediary licences / licenses inducement / movement