9
impossibly
3
actually
2
clearly
2
indeed
2
unlikely(adverb, unmistakably, perceptibly)
1
absolutely
1
certainly
1
definitely
1
implausible(adjective, reasonable, likely, plausible)
1
necessarily
1
sure
0
agreed
0
assuredly
0
compulsorily
0
decidedly
0
dementedly
0
determinately
0
distinctly
0
doubtless
0
emphatically
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APASmart Define. (2016). possibly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/possibly/thesaurus/antonyms
ChicagoSmart Define. 2016. "possibly thesaurus" https://smartdefine.org/possibly/thesaurus/antonyms (accessed September 20, 2026).
HarvardSmart Define 2016, possibly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/possibly/thesaurus/antonyms>.
MLASmart Define. "possibly thesaurus" 30 March 2016. Web. 20 September 2026. <https://smartdefine.org/possibly/thesaurus/antonyms>