222 entries under tough topic. ×
| sturdy(adjective, calm, strong, hard, sound) | |
| secure(verb, adjective, calm, fix, strong) | |
| unswerving(adjective, close, strong, correct) | |
| sure(adjective, calm, good, close, clear) | |
| dogged(adjective, mean, strong, hard) | |
| reliable(adjective, calm, close, clear, strong) | |
| adamantine(adjective, strong, hard, determined) | |
| dense(adjective, set, strong, hard) | |
| strict(adjective, close, strong, hard) | |
| iron(noun, adjective, mean, strong, hard) | |
| persevering(adjective, strong, certain, determined) | |
| true(adjective, good, close, clear, strong) | |
| dependable(adjective, good, close, strong) | |
| hard-nosed(adjective, mean, clear, strong, hard) | |
| inelastic(adjective, hard, solid, determined) | |
| severe(adjective, clear, strong, hard) | |
| stalwart(adjective, calm, strong, sound) | |
| steely(adjective, strong, hard, solid) | |
| stern(adjective, hard, severe, rough) | |
| thick(adjective, close, strong, hard) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 29 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |