| certainly(adverb, interjection) | |
| absolutely(adverb, interjection, very, certainly, clearly) | |
| surely(adverb, absolutely, very, really, easily) | |
| definitely(adverb, interjection) | |
| positively(adverb, interjection) | |
| assuredly(adverb, interjection) | |
| naturally(adverb, interjection) | |
| of course(adverb, interjection) | |
| indubitably(adverb, interjection) | |
| indeed(adverb, absolutely, really, certainly, clearly) | |
| undoubtedly(adverb, absolutely, very, certainly, clearly) | |
| really(adverb, absolutely, very, certainly, definitely) | |
| truly(adverb, absolutely, very, really, certainly) | |
| unquestionably(adverb, absolutely, certainly, clearly, definitely) | |
| yes | |
| undeniably(adverb, absolutely, very, really, positively) | |
| categorically(adverb, positively, unmistakably, roger, veritably) | |
| clearly | |
| doubtless | |
| evidently |
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| APA | Smart Define. (2015). to be sure thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/to_be_sure/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "to be sure thesaurus" https://smartdefine.org/to_be_sure/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, to be sure thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/to_be_sure/thesaurus/synonyms>. |
| MLA | Smart Define. "to be sure thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/to_be_sure/thesaurus/synonyms> |