| steady(certain, unquestionable, undisputable) | |
| sure-fire(adjective, certain, definite, sure, flawless) | |
| unexceptionable | |
| unfailing(adjective, certain, flawless, unquestionable, undisputable) | |
| vowed(verb, promised) | |
| absolutely certain(expression, adjective, set, solid, certain) | |
| affianced | |
| attempted | |
| bankrolled | |
| barred | |
| betrothed | |
| beyond doubt(expression, adjective, set, solid, certain) | |
| bolted | |
| certainly | |
| checked | |
| cinched(adjective, set, clear, simple, plain) | |
| clear-cut(adjective, set, clear, simple, plain) | |
| clinched(adjective, set, solid, certain, sure) | |
| compromised | |
| conclusive(clear, simple, plain, certain, straightforward) |
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| APA | Smart Define. (2015). guaranteed thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/guaranteed/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "guaranteed thesaurus" https://smartdefine.org/guaranteed/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, guaranteed thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/guaranteed/thesaurus/synonyms>. |
| MLA | Smart Define. "guaranteed thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/guaranteed/thesaurus/synonyms> |