- Definitions|2
- Thesaurus|675
- Abbreviations|0
81 entries under hard topic. ×
| inexorable(adjective, strong, tough, resist) | |
| inflexible(adjective, strong, tough, firm) | |
| unrelenting(adjective, strong, tough, resist) | |
| adamant(adjective, strong, tough, firm) | |
| stubborn(adjective, characteristic, quality, strong) | |
| unyielding(adjective, strong, tough, firm) | |
| tough(adjective, strong, firm, unreasonable) | |
| flinty(adjective, strong, tough, firm) | |
| obdurate(adjective, strong, tough, resist) | |
| rigid(adjective, strong, tough, severe) | |
| unbending(adjective, strong, tough, resist) | |
| relentless(adjective, strong, tough, resist) | |
| firm(adjective, strong, tough, determined) | |
| immovable(adjective, strong, tough, cruel) | |
| implacable(adjective, strong, tough, resist) | |
| grim(adjective, strong, tough, resist) | |
| determined(adjective, strong, tough, severe) | |
| resolute(adjective, determined, rigid, strict) | |
| steely(adjective, strong, tough, firm) | |
| iron(adjective, set, strong, tough) |
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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> |