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difficultly(adverb, doubtfully)
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doubtedly(adverb, unmistakably, doubtless, unequivocally, doubtfully)
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APASmart Define. (2015). almost certainly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/almost_certainly/thesaurus/antonyms
ChicagoSmart Define. 2015. "almost certainly thesaurus" https://smartdefine.org/almost_certainly/thesaurus/antonyms (accessed September 20, 2026).
HarvardSmart Define 2015, almost certainly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/almost_certainly/thesaurus/antonyms>.
MLASmart Define. "almost certainly thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/almost_certainly/thesaurus/antonyms>