6
unlikely(adjective, adverb, unmistakably, possibly, perceptibly)
5
hardly(adverb, unlikely, scarcely, illy)
5
most unlikely(expression, unlikely, hardly, scarcely)
5
not likely(expression, unlikely, hardly, scarcely, illy)
5
scarcely(adverb, unlikely, hardly, illy)
4
doubtful(adjective, unlikely, hardly, scarcely, illy)
4
illy(adverb, unlikely, hardly, scarcely)
4
implausible(adjective, unlikely, hardly, scarcely, illy)
4
scarce(adverb, unlikely, hardly, scarcely, illy)
3
faint(adjective, unlikely, hardly, scarcely, illy)
3
improbable(adjective, unlikely, hardly, scarcely, illy)
3
incredible(adjective, unlikely, hardly, scarcely, illy)
3
questionable(adjective, unlikely, hardly, scarcely, illy)
3
remote(adjective, unlikely, hardly, scarcely, illy)
3
slight(adjective, unlikely, hardly, scarcely, illy)
3
unbelievable(adjective, unlikely, hardly, scarcely, illy)
3
unconvincing(adjective, unlikely, hardly, scarcely, illy)
3
unimaginable(adjective, unlikely, hardly, scarcely, illy)
2
ill(adverb, unlikely, hardly, scarcely, illy)
2
uncertain(adjective, unmistakably, perceptibly, palpably)
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APASmart Define. (2015). most likely thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/most_likely/thesaurus/antonyms
ChicagoSmart Define. 2015. "most likely thesaurus" https://smartdefine.org/most_likely/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2015, most likely thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/most_likely/thesaurus/antonyms>.
MLASmart Define. "most likely thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/most_likely/thesaurus/antonyms>