Forbidden vs Unauthorized vs Without authorization

When to use each in English, with meaning, register, and examples.

Forbidden

FormalTop 3,000 (common)

Unauthorized

FormalTop 2,000 (common)

Without authorization

FormalBeyond 10,000 (less common)
Most common: Unauthorized
 ForbiddenUnauthorizedWithout authorization
Pronunciation🇬🇧 //fəˈbɪd.ən//🇺🇸 //fərˈbɪd.ən//🇬🇧 //ˌʌnɔːθəˈraɪzd//🇺🇸 //ˌʌnəˈθɔərəɪzd//🇬🇧 //wɪθˈaʊt ɔːθəraɪˈzeɪʃən//🇺🇸 //wɪθˈaʊt ɔˈθɪrəˌzeɪʃən//
MeaningNot allowed or banned.Not having permission or approval.Not having permission to do something.
ExampleThe secret room was strictly forbidden to anyone except the owner.He accessed the database without permission, so his actions were unauthorized.The employee accessed the files without authorization.
RegisterFormalFormalFormal
How commonTop 3,000 (common)Top 2,000 (common)Beyond 10,000 (less common)
Collocationsforbidden zone, forbidden love, forbidden activities, forbidden fruit, forbidden cityunauthorized access, unauthorized use, unauthorized disclosure, unauthorized personnel, unauthorized transactionsaccess without authorization, act without authorization, enter without authorization
Antonymsallowed, permitted, legalauthorized, permitted, sanctioned-
Common mistakesConfused with 'prohibited' - both mean similar things, but 'forbidden' is less formal., Incorrectly used as a verb - 'forbidden' is strictly an adjective., Using 'forbidden' in positive contexts - it always suggests something disallowed.Confusing with 'unauthorized' and 'unapproved'., Using it to describe actions that are just socially unacceptable., Assuming it can be used in informal contexts.Confused with 'unauthorized' which is a single word., Incorrectly using 'with authorization' when intending to say 'without authorization'.
Usage notesUsed to describe something that is legally or socially unacceptable. Avoid using in casual conversations.Use this term in formal contexts, especially in legal or security discussions. It's not appropriate for casual conversation.Use 'without authorization' in formal contexts like legal or official communications. Avoid in casual conversations.

See it in real clips

Forbidden
Unauthorized
Without authorization

Frequently asked questions: Forbidden vs Unauthorized vs Without authorization

What's the difference between Forbidden, Unauthorized, and Without authorization?

Forbidden: Not allowed or banned. Unauthorized: Not having permission or approval. Without authorization: Not having permission to do something.

Which is more common: Forbidden, Unauthorized, and Without authorization?

Unauthorized is the most common in everyday English.

Can you show an example of each?

Forbidden: The secret room was strictly forbidden to anyone except the owner. Unauthorized: He accessed the database without permission, so his actions were unauthorized. Without authorization: The employee accessed the files without authorization.

Can I use Forbidden, Unauthorized, and Without authorization interchangeably?

Not always. Forbidden, Unauthorized, and Without authorization are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.