- Definitions|2
- Thesaurus|675
- Abbreviations|0
74 entries under tough topic. ×
| steely(adjective, strong, hard, firm) | |
| iron(adjective, set, strong, hard) | |
| uncompliant(adjective, firm, resist, determined) | |
| fixed(adjective, severe, determined, resolute) | |
| hardheaded(adjective, strong, hard, firm) | |
| mulish(adjective, strong, hard, firm) | |
| pigheaded(adjective, determined, resolute, stubborn) | |
| stiff-necked(adjective, strong, hard, firm) | |
| hard-nosed(adjective, strong, hard, determined) | |
| steadfast(adjective, firm, determined, resolute) | |
| strong(adjective, set, hard, strength) | |
| sturdy(adjective, strong, hard, strength) | |
| dogged(adjective, firm, determined, resolute) | |
| rigorous(adjective, set, strong, hard) | |
| bullheaded(adjective, strong, hard, severe) | |
| rugged(adjective, set, strong, hard) | |
| intractable(hard, firm, unreasonable, grim) | |
| robust(adjective, strong, hard, strength) | |
| dense(adjective, set, strong, hard) | |
| durable(adjective, strong, firm, stiff) |
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| APA | Smart Define. (2015). adamantine thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/adamantine/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, adamantine thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>. |
| MLA | Smart Define. "adamantine thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms> |