Synonyms|457Antonyms|115|Broader|9Narrower|12Related|204
3
out of bounds(expression, adjective, idiom, offensive, permitted)
3
outlaw
3
shameful(adjective, unreasonable, improper, unwarranted, prejudiced)
3
sinful
3
smuggled
3
under-the-counter
3
unethical(adjective, bad, wrong, corrupt, wicked)
3
unscrupulous(adjective, bad, wrong, corrupt, dishonest)
2
adulterine
2
beyond the pale(expression, idiom, offensive, permitted, prohibition)
2
blameworthy(adjective, unreasonable, improper, unwarranted, prejudiced)
2
counterfeit(fake, deceitful, untrue)
2
disgraceful
2
heavy(adjective, wrong, informal, senseless, illegitimate)
2
indecorous
2
inequitable(unreasonable, improper, unwarranted, prejudiced, iniquitous)
2
not permitted(expression, idiom, prohibition)
2
off-color(adjective, corrupt, dishonest, crooked, unfair)
2
off base(expression, wrong, senseless, permitted, unjustified)
2
offensive
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ChicagoSmart Define. 2015. "illegal thesaurus" https://smartdefine.org/illegal/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, illegal thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/illegal/thesaurus/synonyms>.
MLASmart Define. "illegal thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/illegal/thesaurus/synonyms>