77 entries under unlikely topic. ×

26
incredible(adjective, great, excellent, flat, poor)
26
unbelievable(adjective, great, excellent, flat, poor)
22
implausible(adjective, great, slight, flat, poor)
17
doubtful(adjective, extraordinary, uncertain, fantastic, dubious)
16
questionable(adjective, uncertain, doubtful, dubious, likely)
15
dubious(adjective, uncertain, doubtful, likely)
14
inconceivable(adjective, great, flat, poor, thin)
14
unconvincing(adjective, great, flat, poor, thin)
10
weak(adjective, great, poor, extraordinary, strange)
8
thin(adjective, weak, great, poor, extraordinary)
6
farfetched(adjective, unreasonable, dubious, flimsy)
5
rare(adjective, extraordinary, strange, doubtful, dubious)
4
dubitable(adjective, uncertain, doubtful, shaky, unsure)
4
impractical(adjective, silly, unreasonable, unrealistic)
4
unpromising
3
slight(adjective, flat, poor, thin, inadequate)
3
slim(adjective, slight, poor, thin, small)
3
uncertain(adjective, doubtful, unsure, likely)
3
unreasonable(adjective, poor, thin, dubious)
2
ambiguous(adjective, shaky, unpromising)
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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>