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| firm belief(confidence, certainty) |
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| APA | Smart Define. (2015). doubtlessness thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/doubtlessness/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "doubtlessness thesaurus" https://smartdefine.org/doubtlessness/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, doubtlessness thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/doubtlessness/thesaurus/synonyms>. |
| MLA | Smart Define. "doubtlessness thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/doubtlessness/thesaurus/synonyms> |