18
indescribable(adjective, awful, foul, disgusting, vague)
13
unutterable(adjective, awful, foul, disgusting, unspeakable)
12
ineffable(adjective, unspeakable)
11
inexpressible(adjective, awful, foul, disgusting, unspeakable)
10
unspeakable(adjective, bad)
8
undefinable
8
untellable
7
vague(adjective, subtle, elusive)
6
incommunicable(adjective, awful, foul, disgusting, unspeakable)
5
undefined
5
undescribable(adjective, unspeakable)
4
elusive(adjective, mysterious, evasive)
4
indefinite
4
indeterminate
3
awful(adjective, unspeakable)
3
amorphous
3
beyond words(expression, adjective, awful, foul, disgusting)
3
defying description(expression, adjective, idiom, unspeakable, undescribable)
3
hazy
3
indistinct
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APASmart Define. (2015). indefinable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/indefinable/thesaurus/synonyms
ChicagoSmart Define. 2015. "indefinable thesaurus" https://smartdefine.org/indefinable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, indefinable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/indefinable/thesaurus/synonyms>.
MLASmart Define. "indefinable thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/indefinable/thesaurus/synonyms>