134 entries under firm topic. ×
| hardened(adjective, hard, tough, solid) | |
| iron(adjective, resolute, rigid, inflexible) | |
| petrified(adjective, hard, rigid, inflexible) | |
| solidified(adjective, set, hard, tough) | |
| hard-core(stubborn, unyielding, unbending) | |
| rocky(adjective, set, strong, hard) | |
| close(adjective, set, hard, tough, severe) | |
| concentrated(adjective, set, strong, hard, tough) | |
| frozen(adjective, hard, uncertain, anxious) | |
| great(adjective, strong, severe, powerful) | |
| impliable(adjective, hard, dead, rigid) | |
| jelled(adjective, set, hard, tough) | |
| mechanical(adjective, hard, rigid, inflexible) | |
| single-minded(adjective, tough, harsh, cruel) | |
| unflexible(adjective, hard, tough, rigid) | |
| congealed(adjective, set, hard, tough) | |
| impenetrable(adjective, set, hard, tough) | |
| incompliant(adjective, hard, tough, severe) | |
| indurate(adjective, set, strong, hard) | |
| indurated(adjective, set, hard, careless) |
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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> |