134 entries under firm topic. ×
| rigid(adjective, feature, state, characteristic, strong) | |
| hard(adjective, feature, state, characteristic, hard) | |
| strong(adjective, strong, severe, strain) | |
| unyielding(adjective, strong, hard, tough, strain) | |
| stable(adjective, secure, strain, steady) | |
| tight(adjective, close, strong, hard, secure) | |
| steadfast(adjective, feature, state, characteristic, strong) | |
| inflexible(adjective, hard, tough, severe, rough) | |
| stubborn(adjective, hard, tough, rough) | |
| resistant(adjective, strong, hard, strain) | |
| refractory(adjective, hard, tough, strain, rough) | |
| durable(adjective, strong, strain, solid) | |
| fast(adjective, great, secure, strain) | |
| inexorable(adjective, tough, severe, harsh) | |
| uncompromising(adjective, hard, tough, severe, rough) | |
| resolute(adjective, strong, hard, tough, severe) | |
| unbending(adjective, hard, correct, severe, rough) | |
| obdurate(adjective, hard, tough, severe, rough) | |
| unrelenting(adjective, tough, severe, harsh) | |
| fixed(adjective, set, hard, secure, rough) |
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| APA | Smart Define. (2015). stiff thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/stiff/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stiff thesaurus" https://smartdefine.org/stiff/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, stiff thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/stiff/thesaurus/synonyms>. |
| MLA | Smart Define. "stiff thesaurus" 24 December 2015. Web. 23 September 2026. <https://smartdefine.org/stiff/thesaurus/synonyms> |