Unregistered
/ʌnˈrɛdʒɪstərd/
Synonyms
- unlicensed
- unlisted
- not recorded
Slang Meanings
Ghosted (informally used to describe someone who has disappeared from a system without a trace).
He ghosted by using an unregistered app.
Under the radar (used to describe actions out of sight from official scrutiny).
They were operating under the radar with their unregistered business.