134 entries under firm topic. ×
| ossified(adjective, set, hard, solid) | |
| pigheaded(adjective, obstinate, stubborn, unbending) | |
| quick(adjective, close, clear, strong, pleasant) | |
| rocklike(adjective, rigid) | |
| secure(adjective, close, strong, solid) | |
| thickened(adjective, set, hard, solid) | |
| unbreakable(adjective, strong, hard, severe) | |
| ungiving | |
| unmovable(adjective, still, fixed, rigid) | |
| vertical(adjective, straight, upright) | |
| annealed(adjective, hard, rigid, inflexible) | |
| arthritic(adjective, hard, dead, rigid) | |
| benumbed(adjective, hard, unfeeling, unsympathetic) | |
| bound(adjective, harsh, cruel, determined) | |
| cemented(adjective, hard, rigid, inflexible) | |
| chilled(adjective, hard, rigid, inflexible) | |
| compelling(adjective, strong, great, severe) | |
| consolidated(adjective, set, hard, solid) | |
| contracted(adjective, close, strong, hard) | |
| convincing(adjective, strong, great, severe) |
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| APA | Smart Define. (2015). stiff thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/stiff/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "stiff thesaurus" https://smartdefine.org/stiff/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, stiff thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/stiff/thesaurus/synonyms>. |
| MLA | Smart Define. "stiff thesaurus" 24 December 2015. Web. 26 September 2026. <https://smartdefine.org/stiff/thesaurus/synonyms> |