Note: in BRIT, also use 'unauthorised'
If something is ~, it has been produced or is happening without official permission.
...the ~ use of a military vehicle...
It has also been made quite clear that the trip was unauthorised.
= unofficial
ADJ
Note: in BRIT, also use 'unauthorised'
If something is ~, it has been produced or is happening without official permission.
...the ~ use of a military vehicle...
It has also been made quite clear that the trip was unauthorised.
= unofficial
ADJ
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012