260 entries under adjective topic. ×
| sere(dull, lead, grim, leaden) | |
| set in stone(expression, idiom, mean, hard) | |
| shaded(dull, lead, grim, leaden) | |
| silvered(dull, lead, grim, leaden) | |
| slate(dull, lead, grim, leaden) | |
| smoky(dull, lead, grim, leaden) | |
| solid as a rock(expression, idiom, strong, solid) | |
| somber(dull, lead, grim, leaden) | |
| staunch(set, strong, hard, tough) | |
| steady(strong, solid, resolution, stable) | |
| stony(set, strong, hard, firm) | |
| stouthearted(persistent, obstinate, insistent, dogged) | |
| stringent(set, hard, stiff, rigid) | |
| stubbed | |
| substantial | |
| sure(strong, tough, firm, solid) | |
| tenable | |
| thick-skinned(mean, hard, tough, harsh) | |
| tight(strong, tough, firm, solid) | |
| tough nut to crack(expression, idiom, mean, hard) |
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| APA | Smart Define. (2015). iron thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/iron/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, iron thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>. |
| MLA | Smart Define. "iron thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms> |