illegal

1 of 2

adjective

il·​le·​gal (ˌ)i(l)-ˈlē-gəl How to pronounce illegal (audio)
Synonyms of illegal
: not according to or authorized by law : contrary to or in violation of a law : unlawful, illicit
also : not sanctioned by official rules (as of a game)
illegality noun
illegally adverb

illegal

2 of 2

noun

plural illegals
often disparaging + offensive
: a person who enters or lives in a country without the documentation required for legal entry or residence

Examples of illegal in a Sentence

Adjective In this state, it is illegal for anyone under the age of 21 to drink alcohol. The team was penalized for an illegal play.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Noun
And beyond stripping illegals of Austrian citizenship, Interior Minister Wolfgang Sobotka of the centrist People’s Party is proposing hefty fines and other punitive measures. George Jahn, The Seattle Times, 24 June 2017 Still, undercover illegals have been discovered in the United States as recently as June 2010, when 10 alleged spies were arrested by the FBI in Boston, New York, New Jersey and Arlington, Va. Harrison Smith, Washington Post, 21 June 2017 Marco stood today, standing on this stage Marco supports legalization and citizenship for 12 million illegals. New York Times, 15 Jan. 2016

Word History

Etymology

Adjective

Middle French or Medieval Latin; Middle French illegal, from Medieval Latin illegalis, from Latin in- + legalis legal

First Known Use

Adjective

1624, in the meaning defined above

Noun

1939, in the meaning defined above

Time Traveler
The first known use of illegal was in 1624

Cite this Entry

“Illegal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/illegal. Accessed 5 Jul. 2026.

Kids Definition

illegal

adjective
il·​le·​gal
(ˈ)il-ˈ(l)ē-gəl
: contrary to the laws or rules : unlawful
illegality
ˌil-i-ˈgal-ət-ē
noun
illegally
(ˈ)il-ˈ(l)ē-gə-lē
adverb

Legal Definition

illegal

adjective
il·​le·​gal il-ˈlē-gəl How to pronounce illegal (audio)
: contrary to or in violation of a law : illicit, unlawful
an illegal contract
illegally adverb

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