What is another word for illegal?

Need synonyms for illegal? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Contrary to or forbidden by law, especially criminal law
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“They need to be believe that illegal activity is going on in premises before searching them.”
Adjective
Not in accordance with standards of honor, decency or fair play
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“He was dismissed by the referee for an illegal tackle.”
Adjective
Contrary to or forbidden by law, especially criminal law
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Adjective
Engaged in piracy or plunder
Adjective
Very disgusting, dirty or unpleasant
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Adjective
Unwarranted or inappropriate because excessive or disproportionate
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Adjective
Contrary to what is usual, traditional, or accepted; not orthodox
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Noun
Foreigner in country without permission
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