76 entries under strong topic. ×
| tenacious(adjective, tough, firm, solid) | |
| immovable(adjective, mean, hard, tough) | |
| steadfast(adjective, tough, firm, determined) | |
| able-bodied | |
| cruel(adjective, hard, tough, inflexible) | |
| lusty | |
| obstinate(adjective, set, mean, hard) | |
| set(verb, adjective, tough, firm) | |
| vigorous | |
| dense(adjective, set, hard, tough) | |
| fast(adjective, tough, firm, solid) | |
| heavy(adjective, hard, tough, inflexible) | |
| tough(adjective, mean, hard, firm) | |
| compact(adjective, set, hard, firm) | |
| dogged(adjective, mean, hard, tough) | |
| ferric(adjective, hard, tough, inflexible) | |
| insensible(adjective, hard, tough, inflexible) | |
| red-blooded | |
| rocky(adjective, set, firm, stiff) | |
| solid(adjective, set, hard, tough) |
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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> |