unauthorized

Definitions

Not having official permission or approval.

Not authorized by law or regulation; illegal.

Examples

The security guard stopped the individual for entering an unauthorized area of the building.

The company issued a warning regarding the use of unauthorized software on office computers.

Any unauthorized access to the server will be reported to the authorities immediately.

Synonyms

illicit forbidden prohibited banned illegal unlicensed unofficial

Antonyms

authorized permitted allowed legal official licensed approved