275 entries under solid topic. ×
| impenetrable(adjective, close, set, hard) | |
| inelastic(adjective, hard, tough, determined) | |
| stalwart(adjective, calm, strong, sound, tough) | |
| steely(adjective, strong, hard, tough) | |
| taut(adjective, strong, hard, secure, rough) | |
| thick(adjective, close, strong, hard, tough) | |
| abiding(adjective, calm, strong, complete, secure) | |
| decisive(adjective, good, set, clear, strong) | |
| changeless(adjective, certain, stable, limited) | |
| close(adjective, set, fix, hard, settle) | |
| immutable(adjective, calm, strong, hard, secure) | |
| set in stone(expression, adjective, idiom, calm, set) | |
| single-minded(adjective, tough, intense, deliberate) | |
| undeviating(adjective, intense, certain, deliberate) | |
| unvarying(adjective, calm, strong, secure) | |
| dedicated(adjective, set, clear, strong, tough) | |
| stony(adjective, hard, cold, indifferent) | |
| unqualified(adjective, complete, total, certain) | |
| unshaken(adjective, set, clear, cold) | |
| anchored(adjective, calm, strong, secure) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |