90 entries under tough topic. ×
| hardened(adjective, hard, firm, solid) | |
| inelastic(adjective, set, hard, firm) | |
| inflexible(adjective, strong, hard, firm) | |
| insensible(adjective, strong, hard, innocent) | |
| iron(adjective, strong, hard, firm) | |
| refractory(adjective, set, hard, firm) | |
| severe(adjective, strong, hard, sturdy) | |
| steel(adjective, strong, hard, sturdy) | |
| steely(adjective, strong, hard, firm) | |
| stiff-necked(adjective, strong, hard, sturdy) | |
| unbending(adjective, strong, hard, firm) | |
| unrelenting(adjective, strong, hard, sturdy) | |
| unsparing(adjective, strong, hard, sturdy) | |
| adamant(adjective, strong, hard, sturdy) | |
| astringent(adjective, strong, hard, sturdy) | |
| austere(adjective, strong, hard, sturdy) | |
| authoritarian(adjective, strong, hard, sturdy) | |
| bitter(adjective, strong, hard, sturdy) | |
| bullheaded(adjective, strong, hard, sturdy) | |
| by the book(expression, adjective, idiom, strong, hard) |
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| APA | Smart Define. (2016). thick thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/thick/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "thick thesaurus" https://smartdefine.org/thick/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, thick thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/thick/thesaurus/synonyms>. |
| MLA | Smart Define. "thick thesaurus" 26 February 2016. Web. 27 September 2026. <https://smartdefine.org/thick/thesaurus/synonyms> |