184 entries under adjective topic. ×

6
unimaginable(light, extraordinary, strange, rare)
5
impossible(extraordinary, unusual, strange, unreasonable)
5
ridiculous(strange, crazy, doubtful, dubious)
5
slender(slight, remote)
5
suspect(open, obscure, uncertain, doubtful)
5
unacceptable(inappropriate, unsuitable, unsuited, inapt)
5
unpromising(inadequate, useless, shaky, inappropriate)
4
doubtable(open, obscure, uncertain, doubtful)
4
dubitable(uncertain, doubtful, shaky, unsure)
4
extraordinary(light, thin, strange, rare)
4
faint(slight, doubtful, remote, dubious)
4
inappropriate(inadequate, useless, unhealthy, unsuitable)
4
unbecoming(inadequate, useless, inappropriate, unhealthy)
4
unclear(uncertain, doubtful, shaky, dubious)
4
uncongenial(inadequate, useless, inappropriate, unhealthy)
4
unrealistic(strange, fantastic, doubtful, dubious)
4
unsuitable(inadequate, useless, inappropriate, unhealthy)
3
debatable(uncertain, doubtful, shaky, unsure)
3
flimsy(light, thin, exceptional, short)
3
marvelous(hard, amazing)
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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>