121 entries under rigid topic. ×
| determined(adjective, clear, strong, hard, severe) | |
| heavy(noun, adjective, good, person, dull) | |
| rocky(adjective, firm, stiff, troubled) | |
| steadfast(adjective, calm, clear, strong, severe) | |
| fixed(adjective, mean, strong, hard, sound) | |
| relentless(adjective, mean, strong, hard, severe) | |
| rigorous(adjective, strong, hard, severe, rough) | |
| unrelenting(adjective, mean, strong, hard, severe) | |
| steady(adjective, calm, strong, sound, heavy) | |
| stringent(adjective, hard, severe, firm, difficult) | |
| austere(adjective, strong, hard, severe, sharp) | |
| hard-line(adjective, characteristic, strong, hard, rough) | |
| unsparing(adjective, strong, hard, severe, rough) | |
| dense(adjective, person, set, body, strong) | |
| inexorable(adjective, mean, strong, hard, firm) | |
| set(verb, adjective, calm, strong, hard) | |
| unwavering(adjective, calm, strong, secure, firm) | |
| authoritarian(noun, adjective, strong, hard, severe) | |
| critical(adjective, hard, difficult, harsh, important) | |
| rocklike(adjective, firm, difficult, stiff) |
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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> |