6
shy
3
illegitimate(adjective, legal)
2
banned
2
black
2
forbidden(adjective, prohibited, outlawed)
2
illegal
2
illicit
2
impermissible
2
lawless
2
obnoxious
2
unauthorized
2
unlawful
2
unofficial
2
unorthodox
2
verboten
2
wrongful
1
blue(adjective, decency, cleanliness)
1
disapproved
1
foul
1
nonofficial
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APASmart Define. (2015). sanctioned thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/sanctioned/thesaurus/antonyms
ChicagoSmart Define. 2015. "sanctioned thesaurus" https://smartdefine.org/sanctioned/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, sanctioned thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sanctioned/thesaurus/antonyms>.
MLASmart Define. "sanctioned thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/sanctioned/thesaurus/antonyms>