Synonyms|282Antonyms|85|Broader|2Narrower|5Related|171
13
unsustainable
3
untenable
2
improbable(adjective, likely)
2
unjustifiable(adjective, untenable)
2
unreasonable(adjective, untenable)
1
groundless
1
illogical
1
implausible(adjective, reasonable, plausible)
1
impossible
1
incredible(adjective, bad, unremarkable)
1
indefensible
1
inexplicable
1
insupportable
1
irrational(adjective, untenable)
1
jejune
1
psycho
1
unbelievable(adjective, plausible, untenable)
1
undefended
1
unexplainable
1
unfounded
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APASmart Define. (2015). tenable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/tenable/thesaurus/antonyms
ChicagoSmart Define. 2015. "tenable thesaurus" https://smartdefine.org/tenable/thesaurus/antonyms (accessed September 21, 2026).
HarvardSmart Define 2015, tenable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/tenable/thesaurus/antonyms>.
MLASmart Define. "tenable thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/tenable/thesaurus/antonyms>