142 entries under firm topic. ×
| true(adjective, strong, determined, careful) | |
| unshakable(adjective, mean, strong, hard) | |
| dour(adjective, hard, severe, sharp) | |
| forbidding(adjective, strong, hard, severe) | |
| forceful(adjective, clear, strong, sound, severe) | |
| indefatigable(adjective, strong, sound, fit) | |
| iron(adjective, mean, strong, hard) | |
| committed(adjective, determined, steady, resolute) | |
| compressed(adjective, set, hard, solid) | |
| fast(adjective, calm, strong, solid) | |
| indurate(adjective, mean, hard, harsh) | |
| no-nonsense(adjective, severe, sharp, harsh) | |
| perverse(adjective, mean, hard, difficult) | |
| pigheaded(adjective, mean, hard, difficult) | |
| seasoned(adjective, strong, hard, sound, fit) | |
| stiff-necked(adjective, mean, strong, hard) | |
| sure(adjective, calm, strong, solid) | |
| unflagging(adjective, strong, sound, fit) | |
| cantankerous(adjective, hard, severe, difficult) | |
| Draconian(adjective, severe, harsh, rigid) |
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| APA | Smart Define. (2016). tough thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/tough/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "tough thesaurus" https://smartdefine.org/tough/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2016, tough thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/tough/thesaurus/synonyms>. |
| MLA | Smart Define. "tough thesaurus" 30 March 2016. Web. 29 September 2026. <https://smartdefine.org/tough/thesaurus/synonyms> |