- Definitions|2
- Thesaurus|675
- Abbreviations|0
| adamantean | |
| at a standstill(expression, idiom) | |
| atomic number 6 | |
| austere(adjective, strong, hard, tough, severe) | |
| authoritarian(adjective, strong, hard, tough, sturdy) | |
| bulky | |
| callous(adjective, set, strong, hard, firm) | |
| certain | |
| corneous | |
| dead set(adjective, determined, resolute, uncompromising, unshakeable) | |
| demanding | |
| diamond | |
| diamond-like | |
| difficult | |
| dour | |
| dyed-in-the-wool(adjective, set, strong, hard, tough) | |
| enduring | |
| frozen | |
| granitic | |
| hard-hearted |
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| APA | Smart Define. (2015). adamantine thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/adamantine/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, adamantine thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>. |
| MLA | Smart Define. "adamantine thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms> |