illegal
/ɪˈli.ɡəl/ adjective A2- Contrary to, forbidden, or not authorized by law, especially criminal law. · This is illegal, you know!· Nearly 40 million people live in UK areas with illegal air pollution
- Forbidden by established rules. · Moving a pawn backward is an illegal move in chess.· The computer program performed an illegal operation and was terminated.
- Totally fictitious, and often issued on behalf of a non-existent territory or country.
- Being or doing something illegally. · illegal immigrant· illegal logger
- Being an illegal immigrant; residing in a country illegally.
From the library
“You mean that he has a great income and that he must earn it in an illegal fashion?”
It is not illegal, however, to keep a lunatic upon private premises so long as there is a qualified person in attendance and that the authorities have been duly notified.
At that time, it was illegal for enslaved people to learn.
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