Illegal vs What you're asking is illegal

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

Illegal

FormalTop 2,000 (common)B1adjective

What you're asking is illegal

Beyond 10,000 (less common)
Most formal: IllegalMost common: Illegal
 IllegalWhat you're asking is illegal
Pronunciation🇬🇧 //ɪˈliːɡ(ə)l//🇺🇸 //ɪˈlɪɡəl//🇬🇧 //wɒt jʊə(r) ˈɑːskɪŋ ɪz ɪˈliːɡəl//🇺🇸 //wʌt jʊr ˈæskɪŋ ɪz ɪˈliɡəl//
MeaningNot allowed by law.What you're asking is against the law.
ExampleDriving without a license is considered illegal.What you're asking is illegal and could lead to serious consequences.
RegisterFormalNeutral
How commonTop 2,000 (common)Beyond 10,000 (less common)
CEFR levelB1-
Part of speechadjective
Collocationsillegal activity, illegal immigration, illegal drugs, illegal parkingask about legality, illegal activities, illegal actions, illegal behavior, illegal trade
Antonymslegal, permissible, lawful-
Common mistakesConfused with 'unlawful', which can have a broader meaning., Using 'illegal' to describe moral wrongs instead of legal ones., Misusing as a noun instead of an adjective, e.g., saying 'the illegal is punishable' instead of 'the act is illegal'.Using 'illicit' incorrectly instead of 'illegal'., Confusing legal terms with general vocabulary., Neglecting to clarify what is illegal.
Usage notesUse 'illegal' in formal contexts, especially legal discussions, but also in general conversation. It's not appropriate for casual slang.Use in formal situations, especially in legal contexts. Avoid casual conversations.

Frequently asked questions: Illegal vs What you're asking is illegal

What's the difference between Illegal and What you're asking is illegal?

Illegal: Not allowed by law. What you're asking is illegal: What you're asking is against the law.

Which is more formal: Illegal and What you're asking is illegal?

Illegal is the most formal of these.

Which is more common: Illegal and What you're asking is illegal?

Illegal is the most common in everyday English.

Can you show an example of each?

Illegal: Driving without a license is considered illegal. What you're asking is illegal: What you're asking is illegal and could lead to serious consequences.

Can I use Illegal and What you're asking is illegal interchangeably?

Not always. Illegal and What you're asking is illegal 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.