unpermitted

adjective
UK /ˌʌnpəˈmɪtɪd/
US /ˌʌnpərˈmɪtɪd/

Not allowed because nobody said it was okay.

The guard stopped the unpermitted visitors at the gate.


OTHER MEANINGS

2. Done without official approval or a license.

The unpermitted building was torn down by the city.

3. Not sanctioned by a person in charge.

He made an unpermitted change to the schedule.

4. Lacking the required written consent.

Unpermitted parking will result in a fine.