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Definition of illegal : Not according to, or authorized by, law; specif., contrary to, or in violation of, human law; unlawful; illicit; hence, immoral; as, an illegal act; illegal trade; illegal love.

Synonyms:

contraband, iniquitous, misbranded, black-market, outlawed, vile, unwarranted, extralegal, immoral, abominable, culpable, proscribed, hot, smuggled, embezzled, banned, ill-gotten, ineligible, unwarrantable, guilty, vicious, mislabeled, after-hours, prohibited, wicked, outside the law, not legal, extrajudicial, stolen, interdicted, law, black, nonlegal, bootlegged, amerciable, penal, uncertified, nefarious, not approved, under-the-counter, outlaw, misappropriated, flagitious, unratified, misbegotten, dirty, irregular, sinful, against the law

illicit, forbidden, unlawful, unconstitutional, unauthorized, bootleg, offensive, actionable, illegitimate, lawless, verboten, taboo, punishable, criminal, wrongful, unjust, unlicensed, felonious

bad, untrue, false, inaccurate, faulty, flawed, wrong, incorrect, improper, mistaken, aberrant, erroneous, fallacious

Usage examples:

• On top of this the Union Parliament has passed a law making even the future purchase of land by Negroes illegal save in restricted areas! - "The Negro", W.E.B. Du Bois.
• It would be illegal, but it would not be the first illegal thing. - "Quiet Talks about Jesus", S. D. Gordon.
• Every execution- criminal or civil- had been therefore illegal. - "The History of Tasmania, Volume I (of 2)", John West.