110 entries under rigid topic. ×
| adamantine(adjective, set, strong, hard, severe) | |
| callous(adjective, set, strong, hard, firm) | |
| congealed(adjective, set, hard, tough, firm) | |
| definite(adjective, good, strong, correct, easy) | |
| frozen(adjective, hard, firm, stiff, tense) | |
| impermeable(adjective, close, set, hard, tough) | |
| nonporous(hard, resistant, impervious, density) | |
| resolute(adjective, calm, strong, secure, tough) | |
| steely(adjective, hard, firm, stiff, tense) | |
| stubborn(adjective, strong, secure, tough, firm) | |
| attached(adjective, secure, inflexible, stubborn) | |
| determined(adjective, strong, severe, certain, definite) | |
| exact(adjective, correct, severe, honest, harsh) | |
| hardened(adjective, set, strong, hard, tough) | |
| inelastic(adjective, hard, tough, severe, firm) | |
| obstinate(adjective, strong, tough, firm, determined) | |
| severe(adjective, correct, harsh, exact, proper) | |
| brittle(adjective, hard, firm, stiff, tense) | |
| harsh | |
| iron(adjective, set, strong, hard, tough) |
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| APA | Smart Define. (2016). solid thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/solid/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "solid thesaurus" https://smartdefine.org/solid/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, solid thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/solid/thesaurus/synonyms>. |
| MLA | Smart Define. "solid thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/solid/thesaurus/synonyms> |