- Definitions|2
- Thesaurus|675
- Abbreviations|0
43 entries under firm topic. ×
| inflexible(adjective, strong, hard, tough) | |
| adamant(adjective, strong, hard, tough) | |
| unyielding(adjective, strong, hard, tough) | |
| tough(adjective, strong, hard, unreasonable) | |
| flinty(adjective, strong, hard, tough) | |
| rigid(adjective, strong, hard, tough, severe) | |
| unbreakable(adjective, strong, tough, severe) | |
| hard(adjective, strong, strength, tough) | |
| impenetrable(adjective, set, tough, stiff) | |
| indestructible(adjective, rigid, unyielding, steely) | |
| rock-hard(adjective, rigid, unyielding, steely) | |
| steely(adjective, strong, hard, tough) | |
| stony(adjective, stiff, rigid, stubborn) | |
| iron(adjective, set, strong, hard, tough) | |
| stiff(adjective, set, harsh, determined) | |
| rocky(adjective, set, stiff, compact) | |
| uncompliant(adjective, tough, resist, determined) | |
| set(adjective, severe, harsh, determined) | |
| hardheaded(adjective, strong, hard, tough) | |
| mulish(adjective, strong, hard, tough) |
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| APA | Smart Define. (2015). adamantine thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/adamantine/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, adamantine thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>. |
| MLA | Smart Define. "adamantine thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms> |