45 entries under improbable topic. ×

22
incredible(adjective, great, flat, poor, thin)
18
improbable(adjective, great, slight, flat, poor)
17
unbelievable(adjective, hard, weak, great, flat)
17
preposterous(adjective, hard, great, difficult, extraordinary)
16
inconceivable(adjective, great, flat, poor, thin)
16
unlikely(adjective, slight, extraordinary, strange, superb)
14
farfetched(adjective, hard, difficult, likely, unlikely)
13
doubtful(adjective, extraordinary, fantastic, amazing, dubious)
13
fantastic(adjective, extraordinary, strange, superb, amazing)
12
dubious(adjective, great, slight, extraordinary, amazing)
12
unconvincing(adjective, weak, great, flat, poor)
10
unthinkable(adjective, extraordinary, unusual, strange, amazing)
10
weak(adjective, great, poor, extraordinary, strange)
9
impossible(adjective, hard, great, difficult, extraordinary)
8
absurd(adjective, hard, difficult, false, strange)
8
unreasonable(adjective, hard, poor, difficult, thin)
7
questionable(adjective, weak, great, flat, poor)
7
remote(adjective, doubtful, dubious, unlikely)
7
ridiculous(adjective, keen, sharp, strange, crazy)
7
thin(adjective, weak, great, poor, informal)
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APASmart Define. (2015). implausible thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/implausible/thesaurus/synonyms
ChicagoSmart Define. 2015. "implausible thesaurus" https://smartdefine.org/implausible/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, implausible thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/implausible/thesaurus/synonyms>.
MLASmart Define. "implausible thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/implausible/thesaurus/synonyms>