260 entries under adjective topic. ×
| inexorable(characteristic, mean, strong, hard) | |
| unyielding(characteristic, mean, strong, hard) | |
| firm(noun, mean, strong, hard) | |
| rigid(mean, strong, hard, tough) | |
| adamant(mean, strong, hard, strength) | |
| stubborn(characteristic, quality, mean, strong) | |
| obdurate(strong, hard, tough, firm) | |
| steel(strong, hard, strength, tough) | |
| inflexible(mean, strong, hard, tough) | |
| hard(noun, characteristic, mean, strong) | |
| relentless(mean, strong, hard, tough) | |
| unrelenting(mean, hard, tough, resist) | |
| unbending(mean, strong, hard, tough) | |
| gray(dull, silver, leaden, steely) | |
| implacable(mean, strong, hard, tough) | |
| uncompromising(mean, hard, resist, determined) | |
| adamantine(set, strong, hard, tough) | |
| intransigent(tough, resist, determined, resolute) | |
| grim(tough, firm, resist, determined) | |
| stern(characteristic, persistent, obstinate, insistent) |
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| APA | Smart Define. (2015). iron thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/iron/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, iron thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>. |
| MLA | Smart Define. "iron thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms> |