92 entries under certain topic. ×
| lasting(calm, strong, steady, substantial) | |
| surefire(sure, reliable, trustworthy, guaranteed) | |
| unflappable(firm, steady, sure, guaranteed) | |
| unquestionable(adjective, sure, guaranteed) | |
| able(adjective, strong, sound, tough, easy) | |
| assiduous(thoughtful, sober, cautious, prudent) | |
| hopeful(strong, reasonable, definite, realistic) | |
| nailed down(expression, strong, definite, sure) | |
| never-failing(adjective, firm, steady, substantial) | |
| on ice(expression, adjective, strong, easy) | |
| poised(adjective, calm, strong, firm) | |
| positive(good, strong, material, steady) | |
| pronounced(adjective, sure, guaranteed) | |
| unflagging(strong, complete, fit, firm) | |
| unhesitating(adjective, serious, resolute, persistent) | |
| upbeat(sure, guaranteed) | |
| absolutely certain(expression, sure, guaranteed) | |
| assertive(sure, guaranteed) | |
| audacious(sure, guaranteed) | |
| beyond doubt(expression, sure, guaranteed) |
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| APA | Smart Define. (2016). solid thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/solid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, solid thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>. |
| MLA | Smart Define. "solid thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms> |