1 forbidden by law; unlawful; illicit
2 unauthorized or prohibited by a code of official or accepted rules
3 a person who has entered or attempted to enter a country illegally
English Collins Dictionary - English Definition & Thesaurus
actionable (Law) banned, black-market, bootleg, criminal, felonious, forbidden, illicit, lawless, off limits, outlawed, prohibited, proscribed, unauthorized, unconstitutional, under-the-counter, under-the-table, unlawful, unlicensed, unofficial, wrongful
lawful, legal, licit, permissible
English Collins Dictionary - English synonyms & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"