Forbidden vs Unauthorized

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

Forbidden

FormalTop 3,000 (common)

Unauthorized

FormalTop 2,000 (common)
Most common: Unauthorized
 ForbiddenUnauthorized
Pronunciation🇬🇧 //fəˈbɪd.ən//🇺🇸 //fərˈbɪd.ən//🇬🇧 //ˌʌnɔːθəˈraɪzd//🇺🇸 //ˌʌnəˈθɔərəɪzd//
MeaningNot allowed or banned.Not having permission or approval.
ExampleThe secret room was strictly forbidden to anyone except the owner.He accessed the database without permission, so his actions were unauthorized.
RegisterFormalFormal
How commonTop 3,000 (common)Top 2,000 (common)
Collocationsforbidden zone, forbidden love, forbidden activities, forbidden fruit, forbidden cityunauthorized access, unauthorized use, unauthorized disclosure, unauthorized personnel, unauthorized transactions
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.
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.

See it in real clips

Forbidden
Unauthorized

Frequently asked questions: Forbidden vs Unauthorized

What's the difference between Forbidden and Unauthorized?

Forbidden: Not allowed or banned. Unauthorized: Not having permission or approval.

Which is more common: Forbidden and Unauthorized?

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.

Can I use Forbidden and Unauthorized interchangeably?

Not always. Forbidden and Unauthorized 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.