| unshaken(adjective, set, clear, strong, flat) | |
| unyielding(adjective, strong, tough, flat, firm) | |
| verifiable(clear, reasonable, sensible, natural, normal) | |
| aye | |
| bright(adjective, plain) | |
| careful(adjective, good, strong, honest, solid) | |
| certainty(noun, belief) | |
| certes(certainty, assent) | |
| cocky(adjective, bold, confident, courageous, arrogant) | |
| complete(adjective, clear, sound, correct, flat) | |
| composed(adjective, calm, quiet, cool, solid) | |
| consummate(adjective, clear, complete, total, certain) | |
| course | |
| credible(adjective, close, correct, pure, true) | |
| derp | |
| determine(verb, certainty) | |
| dogmatic | |
| downright(adjective, adverb, clear, complete, flat) | |
| easy(adjective, calm, quiet, strong, cool) | |
| ensured(adjective, solid, certain, confident, settled) |
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| APA | Smart Define. (2016). sure thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/sure/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "sure thesaurus" https://smartdefine.org/sure/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, sure thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/sure/thesaurus/synonyms>. |
| MLA | Smart Define. "sure thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/sure/thesaurus/synonyms> |