3
slim(adjective, slight, poor, thin, small)
3
smart(great, excellent, superb, super, groovy)
3
sparkling(great, excellent, superb, super, groovy)
3
spectacular(great, excellent, superb, super, groovy)
3
startling(great, excellent, superb, super, groovy)
3
statuesque(great, excellent, superb, super, groovy)
3
stunning(great, excellent, superb, super, groovy)
3
swell(great, excellent, superb, super, groovy)
3
uncertain(adjective, doubtful, unsure, likely, unlikely)
3
unreasonable(adjective, poor, thin, dubious, unlikely)
3
welcome(great, excellent, superb, super, groovy)
3
winning(great, excellent, superb, super, groovy)
2
ambiguous(adjective, shaky, unlikely, unpromising)
2
debatable(adjective, uncertain, doubtful, shaky, unsure)
2
doubtable(shaky, unlikely, unpromising)
2
equivocal(adjective, uncertain, doubtful, unsure)
2
faint(doubtful, dubious)
2
forced
2
grandiloquent
2
hard to believe(expression, adjective, idiom)
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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>