142 entries under firm topic. ×
| sound(adjective, calm, strong, fit) | |
| steadfast(adjective, calm, clear, strong, severe) | |
| relentless(adjective, mean, strong, hard, severe) | |
| rigorous(adjective, strong, hard, severe, rough) | |
| staunch(adjective, calm, clear, strong, sound) | |
| unrelenting(adjective, mean, strong, hard, severe) | |
| intractable(adjective, hard, rough, difficult) | |
| stringent(adjective, hard, severe, difficult) | |
| austere(adjective, strong, hard, severe, sharp) | |
| hard-line(adjective, characteristic, strong, hard, rough) | |
| persistent(adjective, unreasonable, grim, resolute) | |
| resistant(adjective, strong, hard, fit) | |
| spunky(adjective, strong, lively, determined) | |
| stable(adjective, strong, sound, heavy) | |
| unsparing(adjective, strong, hard, severe, rough) | |
| dense(adjective, person, set, body, strong) | |
| inexorable(adjective, mean, strong, hard) | |
| set(verb, adjective, calm, strong, hard) | |
| unwavering(adjective, calm, strong, secure) | |
| authoritarian(noun, adjective, strong, hard, severe) |
For more, visit
Tough on
Power Thesaurus
| 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> |