207 entries under hard topic. ×
| concrete(verb, adjective, close, set, clear) | |
| hard-nosed(adjective, mean, clear, strong) | |
| impenetrable(adjective, close, set, solid) | |
| inelastic(adjective, tough, solid, determined) | |
| severe(adjective, clear, strong, tough) | |
| steely(adjective, strong, tough, solid) | |
| stern(adjective, tough, severe, rough) | |
| taut(adjective, strong, secure, rough) | |
| tense(verb, adjective, strengthen, stiff) | |
| thick(adjective, close, strong, tough) | |
| confirmed(adjective, characteristic, rough, harsh) | |
| close(adjective, set, fix, settle) | |
| immutable(adjective, calm, strong, secure) | |
| set in stone(expression, adjective, idiom, calm, set) | |
| flinty(adjective, strong, tough, severe) | |
| implacable(adjective, mean, strong, tough) | |
| indomitable(adjective, strong, tough, determined) | |
| stony(adjective, solid, cold, indifferent) | |
| compressed(adjective, set, solid, heavy) | |
| concentrated(adjective, set, strong, solid) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 25 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |