9
fanciful(adjective, great, excellent, superb, super)
9
fishy(adjective, uncertain, unreasonable, doubtful, dubious)
9
wonderful(adjective, great, excellent, superb, super)
8
flimsy(adjective, poor, thin, informal, unreasonable)
8
remote(adjective, doubtful, dubious)
8
tall
8
thin(adjective, weak, great, poor, extraordinary)
8
unrealistic(adjective, wild, unreasonable, fantastic, useless)
6
appealing(great, excellent, superb, super, groovy)
6
charming(great, excellent, superb, super, groovy)
6
lovely(great, excellent, superb, super, groovy)
6
amazing(great, excellent, extraordinary, superb, super)
6
astonishing(great, excellent, extraordinary, superb, super)
6
farfetched(adjective, unreasonable, dubious, unlikely, flimsy)
6
marvellous
6
ridiculous(adjective, unbelievable, implausible)
5
fun(great, excellent, superb, super, groovy)
5
preposterous(adjective, extraordinary, fantastic, amazing, unbelievable)
5
rare(adjective, extraordinary, strange, doubtful, dubious)
5
strange(adjective, extraordinary, fantastic, doubtful, dubious)
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APASmart Define. (2015). improbable thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/improbable/thesaurus/synonyms
ChicagoSmart Define. 2015. "improbable thesaurus" https://smartdefine.org/improbable/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, improbable thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/improbable/thesaurus/synonyms>.
MLASmart Define. "improbable thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/improbable/thesaurus/synonyms>