142 entries under firm topic. ×
| stony(adjective, mean, hard, cool, severe) | |
| callous(noun, adjective, mean, hard, cool) | |
| stern(adjective, hard, easy, severe, rough) | |
| adamant(adjective, mean, strong, hard, rough) | |
| indestructible(adjective, rigid, unyielding, steely) | |
| obdurate(adjective, mean, strong, hard, cool) | |
| rock-hard(adjective, rigid, unyielding, steely) | |
| hardened(noun, adjective, characteristic, strong, hard) | |
| powerful(adjective, person, body, strong, great) | |
| resolute(adjective, calm, clear, strong, hard) | |
| solid(adjective, calm, person, body, strong) | |
| stalwart(adjective, calm, person, body, strong) | |
| steely(adjective, strong, hard, serious) | |
| tenacious(adjective, strong, determined, resolute) | |
| obstinate(adjective, mean, strong, hard, rough) | |
| exacting(adjective, dull, hard, easy, severe) | |
| hard-boiled(noun, adjective, mean, strong, hard) | |
| strict(adjective, strong, hard, easy, severe) | |
| determined(adjective, clear, strong, hard, severe) | |
| rocky(adjective, stiff, rigid, troubled) |
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| APA | Smart Define. (2016). tough thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/tough/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "tough thesaurus" https://smartdefine.org/tough/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, tough thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/tough/thesaurus/synonyms>. |
| MLA | Smart Define. "tough thesaurus" 30 March 2016. Web. 28 September 2026. <https://smartdefine.org/tough/thesaurus/synonyms> |