illegal Definition

contrary to or forbidden by law, especially criminal law.

Using illegal: Examples

Take a moment to familiarize yourself with how "illegal" can be used in various situations through the following examples!

  • Example

    It is illegal to drive without a license.

  • Example

    The company was fined for illegal dumping of waste.

  • Example

    Illegal drugs are a major problem in many countries.

illegal Synonyms and Antonyms

Synonyms for illegal

Antonyms for illegal

Phrases with illegal

  • a person who enters a country without permission and without the required legal documents


    The government is cracking down on illegal immigrants.

  • parking in a place where it is not allowed by law


    He received a ticket for illegal parking.

  • downloading copyrighted material without permission or payment


    Illegal downloading of music is a widespread problem.


Summary: illegal in Brief

The term 'illegal' [ɪˈliːɡl] refers to actions that are contrary to or forbidden by law, particularly criminal law. Examples include driving without a license, illegal dumping of waste, and the use of illegal drugs. The term extends to phrases like 'illegal immigrant,' 'illegal parking,' and 'illegal downloading.'

How do native speakers use this expression?