43 entries under implausible topic. ×

29
improbable(adjective, slight, extraordinary, strange, superb)
16
doubtful(adjective, slight, uncertain, shaky, dubious)
13
incredible(adjective, extraordinary, strange, superb, fantastic)
11
dubious(adjective, open, slight, uncertain, doubtful)
10
unbelievable(adjective, obscure, extraordinary, strange, superb)
10
far-fetched(adjective, hard, strange, uncertain, fantastic)
9
questionable(adjective, open, uncertain, doubtful, shaky)
9
unthinkable(adjective, light, thin, extraordinary, unusual)
8
inconceivable(adjective, light, obscure, thin, belief)
7
fantastic(adjective, extraordinary, strange, superb, amazing)
6
unconvincing(adjective, extraordinary, strange, fantastic, doubtful)
6
unimaginable(adjective, light, extraordinary, strange, rare)
5
impossible(adjective, extraordinary, unusual, strange, unreasonable)
4
extraordinary(adjective, light, thin, strange, rare)
4
unrealistic(adjective, strange, fantastic, doubtful, dubious)
3
flimsy(adjective, light, thin, exceptional, short)
3
slim(slight, doubtful, remote)
3
strange(adjective, light, thin, extraordinary, superb)
2
fanciful(adjective, strange, fantastic, doubtful, rare)
2
rare(adjective, light, obscure, thin, extraordinary)
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APASmart Define. (2015). unlikely thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unlikely/thesaurus/synonyms
ChicagoSmart Define. 2015. "unlikely thesaurus" https://smartdefine.org/unlikely/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, unlikely thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unlikely/thesaurus/synonyms>.
MLASmart Define. "unlikely thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/unlikely/thesaurus/synonyms>