Translation guide
How to express that something is not permitted, lacks official approval, or is done without authorization in Japanese.
Unauthorized parking is not permitted.
Entry into this area is unauthorized.
Prefix meaning 'without permission'. Commonly used in compounds like 無断使用 (unauthorized use), 無断転載 (unauthorized reproduction).
Unauthorized reproduction is prohibited.
I used the company computer without authorization.
Means 'illegitimate' or 'unauthorized', often implying wrongdoing. Used in terms like 不正アクセス (unauthorized access).
Unauthorized access was detected.
Specifically means 'not officially authorized/licensed', used for regulated activities or products.
This drug is still unauthorized.
Referring to someone who does not have the right or permission to do something.
Literally 'without authority'. Used for people lacking the proper authorization.
Unauthorized persons cannot access the system.
Means 'without permission'. Can modify a person or action.
Unauthorized persons are prohibited from entering.
Outsider; person not belonging to the group/organization. Often used in signs.
Specifically about using or copying something without permission, often in copyright contexts.
There is no single Japanese word that covers all uses of 'unauthorized'. Choose the expression based on context: permission (許可), authority (権限), or illegitimacy (不正).
無断 focuses on lack of permission, while 不正 implies illegality or wrongdoing. 不正アクセス is the standard term for hacking/unauthorized computer access, not 無断アクセス.
部外者立ち入り禁止。
No unauthorized entry. (Outsiders prohibited.)
Unauthorized reproduction/reprinting. Very common on websites.
Unauthorized reproduction of text from this site is prohibited.
Unauthorized duplication of this CD is prohibited by law.