39 entries under dubious topic. ×

29
improbable(adjective, slight, extraordinary, strange, superb)
18
implausible(adjective, slight, extraordinary, strange, superb)
16
doubtful(adjective, slight, uncertain, shaky)
14
remote(adjective, slight, doubtful, improbable)
13
incredible(adjective, extraordinary, strange, superb, fantastic)
10
unbelievable(adjective, obscure, extraordinary, strange, superb)
9
questionable(adjective, open, uncertain, doubtful, shaky)
8
fishy(adjective, uncertain, doubtful, shaky)
6
absurd(adjective, strange, crazy, unreasonable, fantastic)
6
slight(adjective, doubtful, remote, improbable)
6
unconvincing(adjective, extraordinary, strange, fantastic, doubtful)
6
preposterous(adjective, obscure, strange, exceptional, crazy)
5
ridiculous(adjective, strange, crazy, doubtful)
5
suspect(adjective, open, obscure, uncertain, doubtful)
4
doubtable(adjective, open, obscure, uncertain, doubtful)
4
faint(adjective, slight, doubtful, remote)
4
unclear(adjective, uncertain, doubtful, shaky)
4
unrealistic(adjective, strange, fantastic, doubtful)
3
strange(adjective, light, thin, extraordinary, superb)
2
odd(adjective, strange, crazy, irregular, doubtful)
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APASmart Define. (2015). unlikely thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unlikely/thesaurus/synonyms
ChicagoSmart Define. 2015. "unlikely thesaurus" https://smartdefine.org/unlikely/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, unlikely thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unlikely/thesaurus/synonyms>.
MLASmart Define. "unlikely thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/unlikely/thesaurus/synonyms>