338 entries under strong topic. ×
| immutable(adjective, calm, hard, secure) | |
| pertinacious(adjective, tough, determined, steady) | |
| set in stone(expression, adjective, idiom, calm, set) | |
| strong-willed(adjective, tough, intense, deliberate) | |
| tireless(adjective, determined, steady, resolute) | |
| unvarying(adjective, calm, secure, solid) | |
| dedicated(adjective, set, clear, tough) | |
| earnest(adjective, severe, harsh, important) | |
| flinty(adjective, hard, tough, severe) | |
| implacable(adjective, mean, hard, tough) | |
| indomitable(adjective, hard, tough, determined) | |
| anchored(adjective, calm, secure, solid) | |
| concentrated(adjective, set, hard, solid) | |
| fastened(adjective, sound, secure, short) | |
| hardy(noun, adjective, sound, tough) | |
| heavy(adjective, set, hard, sound) | |
| indefatigable(adjective, tough, fit, solid) | |
| purposeful(adjective, tough, determined, serious) | |
| rugged(adjective, set, hard, sound) | |
| bound(adjective, set, tough, intense) |
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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> |