Definition of unregistered
: not registered: such as
a
: not having entered one's name on a voting list
unregistered voters
b
: unrecorded or not filed in the place provided by law
an unregistered motor vehicle
c
: not recorded with or certified by an appropriate breeders' association
unregistered cattle
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Merriam-Webster unabridged
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Time Traveler for unregistered
The first known use of unregistered was in 1603
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