Forbidden vs Unconstitutional
When to use each in English, with meaning, register, and examples.
Forbidden
FormalTop 3,000 (common)
Unconstitutional
FormalBeyond 10,000 (less common)B1adjective
Most common: Forbidden
| Forbidden | Unconstitutional | |
|---|---|---|
| Pronunciation | 🇬🇧 //fəˈbɪd.ən//🇺🇸 //fərˈbɪd.ən// | 🇬🇧 /["/ˌʌnˌkɒnstɪˈtjuːʃənl/"]/🇺🇸 /["/ˌʌnˌkɑːnstɪˈtuːʃənl/"]/ |
| Meaning | Not allowed or banned. | Not allowed by the constitution of a country. |
| Example | The secret room was strictly forbidden to anyone except the owner. | The judges declared the decision unconstitutional. |
| Register | Formal | Formal |
| How common | Top 3,000 (common) | Beyond 10,000 (less common) |
| CEFR level | - | B1 |
| Part of speech | adjective | |
| Collocations | forbidden zone, forbidden love, forbidden activities, forbidden fruit, forbidden city | unconstitutional law, unconstitutional action, declare unconstitutional |
| Antonyms | allowed, permitted, legal | constitutional, legal |
| Common mistakes | Confused 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 'illegitimate' when they are not exactly the same., Using it in non-legal contexts., Incorrectly conjugating as a verb. |
| Usage notes | Used to describe something that is legally or socially unacceptable. Avoid using in casual conversations. | Use 'unconstitutional' in legal and formal contexts when referring to laws or actions that violate a constitution. Avoid in casual conversations. |
See it in real clips
Frequently asked questions: Forbidden vs Unconstitutional
What's the difference between Forbidden and Unconstitutional?
Forbidden: Not allowed or banned. Unconstitutional: Not allowed by the constitution of a country.
Which is more common: Forbidden and Unconstitutional?
Forbidden 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. Unconstitutional: The judges declared the decision unconstitutional.
Can I use Forbidden and Unconstitutional interchangeably?
Not always. Forbidden and Unconstitutional 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.