127 entries under adjective topic. ×

27
prohibited(verb, adverb, irregular, restricted)
22
verboten(allow, illegal, allowed, prohibited)
20
banned(verb, adverb, irregular, restricted)
17
illegal(adverb, offensive, unreasonable, improper)
16
taboo(adverb, allow, informal, irregular)
14
proscribed(verb, irregular, unwarranted, illegitimate)
11
outlawed(verb, offensive, irregular, unwarranted)
9
illicit
9
unlawful
9
disallowed(verb, prohibited, excluded)
8
barred(verb, prohibited, excluded)
8
out of bounds(expression, idiom, restricted, prohibited)
7
tabu
7
out
6
unauthorized
6
contraband(unlawful, prohibited, banned, outlawed)
6
interdicted
6
off limits(expression, idiom, offensive, permitted)
6
unmentionable(offensive, permitted, prohibited, unspeakable)
5
criminal
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APASmart Define. (2015). forbidden thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/forbidden/thesaurus/synonyms
ChicagoSmart Define. 2015. "forbidden thesaurus" https://smartdefine.org/forbidden/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, forbidden thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/forbidden/thesaurus/synonyms>.
MLASmart Define. "forbidden thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/forbidden/thesaurus/synonyms>