Synonyms|351Antonyms|47|Broader|4Narrower|0Related|218
12
improbably
7
implausibly
7
unlikely(adverb, reasonable, likely, unmistakably, possibly)
6
unthinkably
3
incredibly
3
unbelievably
3
doubtfully
3
doubtless
3
absurdly
3
exceptionally
3
implausible(adjective, reasonable, likely, plausible)
2
absolutely
2
extraordinarily
2
extremely
2
fantasticly
2
impossibly
2
inconceivably
2
indeed
2
needlessly
2
out of the blue
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APASmart Define. (2015). probably thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/probably/thesaurus/antonyms
ChicagoSmart Define. 2015. "probably thesaurus" https://smartdefine.org/probably/thesaurus/antonyms (accessed September 20, 2026).
HarvardSmart Define 2015, probably thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/probably/thesaurus/antonyms>.
MLASmart Define. "probably thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/probably/thesaurus/antonyms>