134 entries under firm topic. ×
| relentless(adjective, tough, severe, harsh) | |
| obstinate(adjective, hard, tough, rough) | |
| formal(adjective, characteristic, tough, correct, severe) | |
| set(adjective, hard, secure, tough, severe) | |
| tough(adjective, strong, hard, severe, rough) | |
| adamant(adjective, hard, rough, harsh) | |
| tense(adjective, hard, property, rigid) | |
| severe(adjective, hard, tough, rough) | |
| solid(adjective, set, strong, hard, secure) | |
| unbendable(adjective, determined, resolute, rigid) | |
| taut(adjective, hard, rough, harsh) | |
| wooden(adjective, dull, hard, correct) | |
| inelastic(adjective, hard, tough, solid) | |
| strict(adjective, hard, tough, severe, rough) | |
| potent(adjective, strong, great, severe) | |
| starchy(adjective, hard, proper, grand) | |
| stern(adjective, hard, severe, rough) | |
| adamantine(adjective, determined, resolute, rigid) | |
| dense(adjective, set, strong, hard, tough) | |
| hard-nosed(adjective, hard, severe, rough) |
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| APA | Smart Define. (2015). stiff thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/stiff/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stiff thesaurus" https://smartdefine.org/stiff/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, stiff thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/stiff/thesaurus/synonyms>. |
| MLA | Smart Define. "stiff thesaurus" 24 December 2015. Web. 25 September 2026. <https://smartdefine.org/stiff/thesaurus/synonyms> |