8
unauthorized(adjective, illegal, permitted, pirate, sanctioned)
6
illegal(adjective, undueness)
6
illicit(adjective, undueness)
6
unlawful(adjective, undueness)
6
unofficial(adjective, informal, illegal, pirate, unauthorized)
4
illegitimate(adjective, legal)
3
unallowed
3
unlicensed
3
verboten
2
banned
2
disallowed(adjective, undueness)
2
forbidden
2
informal(adjective, unauthorized)
2
null(adjective, void, unsound, puny, meaningless)
2
outlawed
2
prohibited
2
unapproved(adjective, illegal, permitted, illegitimate, unjustified)
2
unendorsed(adjective, unauthorized)
2
unjustified(adjective, undueness)
2
void(adjective, unsound, ineffective, meaningless, ineffectual)
11 years ago|1.3k views|share |citing 
APASmart Define. (2015). unsanctioned thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/unsanctioned/thesaurus/synonyms
ChicagoSmart Define. 2015. "unsanctioned thesaurus" https://smartdefine.org/unsanctioned/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, unsanctioned thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/unsanctioned/thesaurus/synonyms>.
MLASmart Define. "unsanctioned thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/unsanctioned/thesaurus/synonyms>