adj
unregistered
adj
1
Not formally recorded on an official list or register.
"Driving an unregistered vehicle can lead to a fine."
"The charity flagged thousands of unregistered voters."
How to Use Unregistered
Learner’s notesIn plain EnglishNot officially listed or recorded — e.g. a vehicle, business, or voter.
Common pairings
unregistered vehicle
unregistered voter
unregistered business
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Etymology
From un- ("not") plus registered.