unauthorised

Done without approval

Unauthorised is the British spelling of unauthorized, describing actions, access, or persons lacking official permission or approval.

Banks flag unauthorised transactions on your account; companies warn against unauthorised use of their logos; buildings post signs prohibiting unauthorised personnel.

The word implies that proper channels exist for granting permission, but they weren't followed.

prohibited

forbidden

Not allowed

prohibited · restricted · outlawed · unsanctioned · unlicensed · unapproved · unpermitted · interdicted · verboten · taboo

activity

smuggling

Illegal covert transport

fraud · black-market · poaching · squatting · embezzlement · laundering · trafficking · forgery · misconduct · corruption

access

intrusion

Unauthorized entry into space

infiltration · penetration · entry · login · trespass · incursion · backdoor · exploit · vulnerability · cyberattack

intrusion

trespasser

Unlawful entrant on property

unwelcome · encroachment · invasion · overstepping · transgression · violation · prowler · squatter · gatecrashing · impersonation

Opposites
permission/approval status

unauthorisedauthorised

Formally permitted or empowered

authorized · permitted · approved · sanctioned · allowed

legitimacy/official standing

unauthorisedofficial

Authority-sanctioned person or status

commissioned · legitimate · certified · registered · recognized

Family

authority, authorize, authorized, authors, unauthorized, authored, preauthorization, authoritative, authorization

Familiarity
Top 200,000
Profile
Known to kids · Timeless · Abstract · Everyday, not technical · Rated G