- Definitions|2
- Thesaurus|675
- Abbreviations|0
| puissant(adjective, strength) | |
| recalcitrant(tough, firm, unreasonable, grim, obstinate) | |
| rock | |
| rock-ribbed(adjective, determined, resolute, uncompromising, unshakeable) | |
| single-minded(tough, firm, cruel, stiff, strict) | |
| sound | |
| stable | |
| standpat | |
| stationary | |
| staunch(hard, resolute, rigid, inflexible, strict) | |
| stony-hearted | |
| stringent(adjective, hard, severe, stiff, resolute) | |
| strong-willed(adjective, determined, resolute, uncompromising, unshakeable) | |
| stubborn as a mule(adjective, idiom, resist, firmly) | |
| sure | |
| thick(adjective, strong, hard, tough, firm) | |
| unaffected | |
| unalterable | |
| unchanging | |
| ungiving |
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| APA | Smart Define. (2015). adamantine thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/adamantine/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, adamantine thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>. |
| MLA | Smart Define. "adamantine thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms> |