12
taboo(adjective, permitted, allowed, unspeakable)
9
unspeakable(adjective, good, words, decent)
8
forbidden(adjective, offensive, permitted, prohibited, unspeakable)
7
despicable(adjective, disrepute, nameless)
7
indescribable
7
scandalous(adjective, disrepute, unspeakable)
7
shameful(adjective, disrepute, unspeakable)
6
disgraceful(adjective, disrepute, unspeakable)
6
disreputable(adjective, disrepute, nameless)
6
offensive(adjective, nameless, unspeakable)
5
ineffable
5
undergarment
4
atrocious(adjective, unspeakable)
4
foul
4
indecent
4
interdicted
4
nameless
4
unutterable
3
banned(adjective, offensive, permitted, prohibited, unthinkable)
3
dirty
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APASmart Define. (2015). unmentionable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/unmentionable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unmentionable thesaurus" https://smartdefine.org/unmentionable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, unmentionable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/unmentionable/thesaurus/synonyms>.
MLASmart Define. "unmentionable thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/unmentionable/thesaurus/synonyms>