Used as a participial adjective (and very rarely as the past participle of the verb ‘unauthorise’) to describe actions carried out without official permission.
Definitions
unauthorisedadjective
Not having official permission or approval.
The unauthorised access to the building was quickly detected by security.
Not recognized or sanctioned by a governing body or authority.
The unauthorised biography contained many controversial claims about the celebrity.
unauthorisedpast participle
Performed or obtained without official authorisation.
The documents were acquired by unauthorised methods.