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 being in accordance with the rules or standards of what is fair in sport
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“He was dismissed by the referee for an illegal tackle.”
Adjective
Contrary to or forbidden by law, especially criminal law
Adjective
Engaged in piracy or plunder
Adjective
Very disgusting, dirty or unpleasant
Adjective
Unwarranted or inappropriate because excessive or disproportionate
Adjective
That can be used as the basis for taking action
Adjective
Contrary to what is usual, traditional, or accepted; not orthodox
Adjective
Lacking in natural or spontaneous quality
Noun
Foreigner in country without permission
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