142 entries under firm topic. ×
| constant(adjective, calm, strong, secure) | |
| grim(adjective, strong, hard, severe) | |
| hale(adjective, strong, sound, fit) | |
| headstrong(adjective, hard, rough, difficult) | |
| implacable(adjective, mean, strong, hard) | |
| inured(noun, adjective, strong, hard, sound) | |
| lusty(adjective, strong, fit, solid) | |
| bullheaded(adjective, strong, hard, difficult) | |
| dogged(adjective, mean, strong, hard) | |
| reliable(adjective, calm, strong, secure) | |
| rocklike(adjective, difficult, stiff, rigid) | |
| thick(adjective, person, set, body, strong) | |
| aloof(adjective, calm, mean, hard, cool) | |
| hard as nails(expression, adjective, idiom, strong, hard) | |
| intransigent(adjective, determined, resolute, obstinate) | |
| mulish(adjective, mean, strong, hard) | |
| persevering(adjective, determined, unreasonable, grim) | |
| pertinacious(adjective, determined, resolute, obstinate) | |
| refractory(adjective, hard, rough, grim) | |
| set in stone(expression, adjective, idiom, calm, mean) |
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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> |