159 entries under rigid topic. ×
| hard-boiled(adjective, mean, strong, hard, tough) | |
| immotile(calm, secure, still, steady, fixed) | |
| impliable(adjective, hard, solid, stiff) | |
| indurated(adjective, set, strong, hard, stiff) | |
| opinionated(adjective, tough, determined, unreasonable, fixed) | |
| ossified(adjective, set, hard, solid, heavy) | |
| pitiless(difficult, fixed, troubled, inflexible) | |
| puritanical(adjective, tough, severe, harsh) | |
| thickened(adjective, set, hard, solid, heavy) | |
| unadaptable(adjective, hard, inflexible, strict) | |
| annealed(adjective, hard, solid, stiff) | |
| arthritic(adjective, hard, solid, stiff) | |
| benumbed(adjective, hard, solid, stiff) | |
| buckram(adjective, hard, solid, stiff) | |
| chilled(adjective, hard, solid, stiff) | |
| creaky(adjective, hard, solid, stiff) | |
| disciplinary(adjective, strong, hard, tough, severe) | |
| forbidding(adjective, strong, hard, tough, severe) | |
| graceless(adjective, hard, solid, stiff) | |
| hard as nails(expression, adjective, idiom, set, strong) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 26 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |