4
uncongenial(adjective, inadequate, useless, inappropriate, unhealthy)
4
unpropitious
4
unrealistic(adjective, strange, fantastic, doubtful, dubious)
4
unsuitable(adjective, inadequate, useless, inappropriate, unhealthy)
3
clouded(shaky, ambiguous, unpromising)
3
debatable(adjective, uncertain, doubtful, shaky, unsure)
3
flimsy(adjective, light, thin, exceptional, short)
3
inauspicious
3
marvelous(adjective, hard, amazing)
3
objectionable
3
slim(slight, doubtful, remote, implausible)
3
small(adjective, slight, remote)
3
strange(adjective, light, thin, extraordinary, superb)
3
tall
3
unapt(adjective, doubtful, likely)
3
unattractive
3
unfitting
3
unreasonable(adjective, unusual, ridiculous, absurd, unbelievable)
3
unseemly
2
ambiguous(adjective, shaky, unpromising)
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APASmart Define. (2015). unlikely thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/unlikely/thesaurus/synonyms
ChicagoSmart Define. 2015. "unlikely thesaurus" https://smartdefine.org/unlikely/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, unlikely thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unlikely/thesaurus/synonyms>.
MLASmart Define. "unlikely thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/unlikely/thesaurus/synonyms>