Forbidden vs Out of bounds

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

Forbidden

FormalTop 3,000 (common)

Out of bounds

Top 3,000 (common)
Most formal: Forbidden
 ForbiddenOut of bounds
Pronunciation🇬🇧 //fəˈbɪd.ən//🇺🇸 //fərˈbɪd.ən//🇬🇧 //aʊt əv baʊndz//🇺🇸 //aʊt əv baʊndz//
MeaningNot allowed or banned.not allowed or outside limits
ExampleThe secret room was strictly forbidden to anyone except the owner.The ball went out of bounds during the game.
RegisterFormalNeutral
How commonTop 3,000 (common)Top 3,000 (common)
Collocationsforbidden zone, forbidden love, forbidden activities, forbidden fruit, forbidden cityout of bounds area, out of bounds rules, out of bounds situation
Antonymsallowed, permitted, legalwithin bounds, in limits
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.Confused with 'out of bonds' which is incorrect., Used in contexts outside of sports or limits, which can be inappropriate.
Usage notesUsed to describe something that is legally or socially unacceptable. Avoid using in casual conversations.Use in sports or any context where something is outside the accepted area. Not used in formal writing.

See it in real clips

Forbidden
Out of bounds

Frequently asked questions: Forbidden vs Out of bounds

What's the difference between Forbidden and Out of bounds?

Forbidden: Not allowed or banned. Out of bounds: not allowed or outside limits

Which is more formal: Forbidden and Out of bounds?

Forbidden is the most formal of these.

Can you show an example of each?

Forbidden: The secret room was strictly forbidden to anyone except the owner. Out of bounds: The ball went out of bounds during the game.

Can I use Forbidden and Out of bounds interchangeably?

Not always. Forbidden and Out of bounds 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.