45 entries under unpromising topic. ×

29
improbable(adjective, slight, extraordinary, strange, superb)
16
doubtful(adjective, slight, uncertain, shaky, dubious)
10
far-fetched(adjective, hard, strange, uncertain, fantastic)
9
questionable(adjective, open, uncertain, doubtful, shaky)
8
fishy(adjective, uncertain, doubtful, shaky, dubious)
5
indefinite(shaky, ambiguous)
5
indistinct(shaky, ambiguous)
5
suspect(adjective, open, obscure, uncertain, doubtful)
4
borderline(shaky, ambiguous)
4
doubtable(adjective, open, obscure, uncertain, doubtful)
4
dubitable(adjective, uncertain, doubtful, shaky, unsure)
4
unclear(adjective, uncertain, doubtful, shaky, dubious)
3
clouded(shaky, ambiguous)
3
debatable(adjective, uncertain, doubtful, shaky, unsure)
2
ambiguous(adjective, shaky)
2
obscure(shaky, unknown, unfamiliar, unbelievable)
2
shady(adjective, open, obscure, uncertain, doubtful)
2
speculative
1
chancy(uncertain, doubtful, shaky, unsure)
1
iffy(uncertain, doubtful, shaky, unsure, implausible)
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APASmart Define. (2015). unlikely thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/unlikely/thesaurus/synonyms
ChicagoSmart Define. 2015. "unlikely thesaurus" https://smartdefine.org/unlikely/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, unlikely thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/unlikely/thesaurus/synonyms>.
MLASmart Define. "unlikely thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/unlikely/thesaurus/synonyms>