13
possible(adjective, unreasonable, likely, unlikely, attainable)
8
likely(adjective, unlikely)
6
feasible(adjective, improper, possible, doable)
6
credible(adjective, unsound, unbelievable, believable)
5
achievable
5
attainable
5
believable
5
manageable
5
practicable(adjective, unreasonable)
5
realistic
5
tolerable
4
conceivable
4
doable
4
plausible
4
possibility(noun, chance, certainty, likelihood, feasibility)
4
potential(noun, adjective, possibility, promising)
4
practical(adjective, reasonable, sensible, unreasonable, useful)
4
probable
4
viable(adjective, reasonable, practicable)
3
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APASmart Define. (2016). impossible thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/impossible/thesaurus/antonyms
ChicagoSmart Define. 2016. "impossible thesaurus" https://smartdefine.org/impossible/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2016, impossible thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/impossible/thesaurus/antonyms>.
MLASmart Define. "impossible thesaurus" 9 March 2016. Web. 22 September 2026. <https://smartdefine.org/impossible/thesaurus/antonyms>