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View synonyms for

illegal

[ ih-lee-guhl ]

adjective

  1. forbidden by law or statute.

    Synonyms: , , ,

  2. contrary to or forbidden by official rules, regulations, etc.:

    The referee ruled that it was an illegal forward pass.



noun

  1. Informal: Disparaging and Offensive. illegal alien.

illegal

/ ɪˈːɡə /

adjective

  1. forbidden by law; unlawful; illicit
  2. unauthorized or prohibited by a code of official or accepted rules
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. a person who has entered or attempted to enter a country illegally
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Sensitive Note

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Derived Forms

  • ˌˈٲ, noun
  • ˈ𲵲, adverb
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Other Word Forms

  • ·g· adverb
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Word History and Origins

Origin of illegal1

From the Medieval Latin word ŧ, dating back to 1620–30. See il- 2, legal
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Compare Meanings

How does illegal compare to similar and commonly confused words? Explore the most common comparisons:

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Synonym Study

Illegal, unlawful, illegitimate, illicit, criminal can all describe actions not in accord with law. Illegal refers most specifically to violations of statutes or, in organized athletics, codified rules: an illegal seizure of property; an illegal block ( in football ). Unlawful means not sanctioned by or according to law: an unlawful claim to the inheritance; to take unlawful advantage of the trading situation. Illegitimate means lacking legal or traditional right or rights: an illegitimate child; illegitimate use of privileged knowledge. Illicit, which originally meant simply “not permitted,” now most often applies to matters regulated by law with specific emphasis on the way things are carried out: illicit conversion of property; an illicit attempt to control the market. Criminal most often refers to violation of the statutes of penal as opposed to civil law. All felonies are criminal as are all crimes sometimes punishable by death such as murder, arson, and kidnapping: a criminal act.
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Example Sentences

Examples have not been reviewed.

That proposed ban would apply to Google’s AI products, including Gemini, which the government says were aided by the company’s illegal monopoly in search.

From

The second order directs every federal agency to ensure that payments to state and local governments do not “abet so-called ‘sanctuary’ policies that seek to shield illegal aliens from deportation.”

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The US deal offers American legal acceptance of Russia's illegal annexation of Crimea and de facto recognition of Russian control of other occupied areas, including all of Luhansk region.

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When Thailand decriminalised cannabis in 2022, a surge of illegal shipments threatened to overwhelm UK Border Force - which uncovered 15 tonnes of the drug in the post in the final quarter of last year.

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US President Donald Trump has some well-known nemeses: illegal immigrants, low-flow showers and last, but definitely not least, the head of the US central bank.

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Ille-et-Vilaineillegal alien