260 entries under adjective topic. ×
| refractory(persistent, obstinate, insistent, dogged) | |
| rock-ribbed(determined, resolute, uncompromising, unshakeable) | |
| single-minded(tough, firm, unreasonable, grim) | |
| stiff-necked(mean, hard, tough, firm) | |
| stone(dull, lead, grim, hardness) | |
| strict(hard, persistent, rigid, obstinate) | |
| strong-willed(determined, resolution, resolute, uncompromising) | |
| tough(mean, strong, hard, firm) | |
| uncooperative(mean, hard, persistent, rigid) | |
| unflinching(resolution, persistent, obstinate, insistent) | |
| compact(set, strong, hard, firm) | |
| dogged(mean, strong, hard, tough) | |
| durable(firm, stiff, rigid) | |
| ferric(strong, hard, tough, inflexible) | |
| gritty | |
| immutable(set, hard, stiff, rigid) | |
| insensible(strong, hard, tough, inflexible) | |
| red-blooded | |
| rocky(set, strong, firm, stiff) | |
| rude |
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| APA | Smart Define. (2015). iron thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/iron/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2015, iron thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>. |
| MLA | Smart Define. "iron thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms> |