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unauthorized
01
not endowed with authority
02
not officially permitted or approved by a recognized authority
unauthorized
adj
authorized
adj
authorize
v
authority
n
Example
The security guard's vigilance prevented unauthorized access to the building.
The sealed door prevented unauthorized entry into the room.
The security measures in place prevent unauthorized access to the building.
Unauthorized access to the secured facility was a breach of security protocols.
Strict security measures in place preclude unauthorized entry into the restricted zone.