2
unworkable(adjective, wild, silly, unreasonable, useless)
2
weird
1
abstract(wild, unreasonable, useless, absurd, unrealistic)
1
allegorical(mythical, fabled, mythological)
1
apocryphal(mythical, fabled, mythological)
1
arguable(uncertain, doubtful, unsure)
1
belief(extraordinary, strange, unbelievable, implausible, unthinkable)
1
beyond belief(expression, adjective, extraordinary, amazing, unbelievable)
1
beyond reason(expression, extraordinary, strange, unbelievable, implausible)
1
calculable
1
chancy(uncertain, doubtful, shaky, unsure, unlikely)
1
chimerical(wild, unreasonable, useless, absurd, abstract)
1
cockamamie(extraordinary, amazing, incredible)
1
cockeyed(extraordinary, amazing, incredible)
1
created(mythical, fabled, mythological)
1
customary(mythical, fabled, mythological)
1
deficient(adjective, flat, poor, thin, small)
1
diffident(uncertain, doubtful, unsure)
1
disputable(uncertain, doubtful, unsure)
1
dissimilar
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APASmart Define. (2015). improbable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/improbable/thesaurus/synonyms
ChicagoSmart Define. 2015. "improbable thesaurus" https://smartdefine.org/improbable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, improbable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/improbable/thesaurus/synonyms>.
MLASmart Define. "improbable thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/improbable/thesaurus/synonyms>