Synonyms|72Antonyms|2|Broader|0Narrower|0Related|0
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dubious(adjective, clear, honest, uncertain, doubtful)
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faltering(adjective, uncertain, doubtful, unfaltering, convalescent)
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APASmart Define. (2015). undoubtful thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/undoubtful/thesaurus/antonyms
ChicagoSmart Define. 2015. "undoubtful thesaurus" https://smartdefine.org/undoubtful/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2015, undoubtful thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/undoubtful/thesaurus/antonyms>.
MLASmart Define. "undoubtful thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/undoubtful/thesaurus/antonyms>