Part of speech:
Not approved or sanctioned:
Not sanctioned by custom or law; improper or unlawful.
Assuming the appearance of something; deceitful; hypocritical.
(Radio) Designating or of an unwanted signal transmitted or received at other than the desired frequency
Prohibited by official rules:
The definition of contraband is not allowed to be imported or exported.
Breaking with convention or tradition; not orthodox.
That can be allowed; permissible
The definition of official is authorized, or is someone who holds a position of authority.
Find another word for unauthorized. In this page you can discover 30 synonyms, antonyms, idiomatic expressions, and related words for unauthorized, like: unofficial, apocryphal, unapproved, illicit, outlawed, prohibited, counterfeit, proscriptive, spurious, tabu and unallowed.