65 entries under tough topic. ×
| recalcitrant(firm, persistent, obstinate, stubborn) | |
| solid(adjective, set, strong, hard) | |
| thick(adjective, strong, hard, firm) | |
| bound(verb, adjective, strong, firm) | |
| bullhead(adjective, mean, hard, harsh) | |
| callous(adjective, set, mean, strong, hard) | |
| fixed(adjective, mean, strong, hard) | |
| hard-boiled(adjective, mean, hard, harsh) | |
| hard-hearted(adjective, mean, hard, harsh) | |
| hard-nosed(adjective, mean, hard, harsh) | |
| mean(adjective, hard, harsh, unfeeling) | |
| mulish(adjective, mean, strong, hard) | |
| perverse(adjective, mean, hard, firm) | |
| pigheaded(adjective, mean, hard, firm) | |
| staunch(adjective, set, strong, hard) | |
| sure(adjective, strong, firm, solid) | |
| thick-skinned(adjective, mean, hard, harsh) | |
| tight(adjective, strong, firm, solid) | |
| uncompassionate(adjective, mean, hard, harsh) | |
| unimpressible(adjective, mean, hard, harsh) |
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| APA | Smart Define. (2015). iron thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/iron/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, iron thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>. |
| MLA | Smart Define. "iron thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms> |