79 entries under hard topic. ×
| arthritic(adjective, firm, solid, tense) | |
| benumbed(adjective, firm, solid, tense) | |
| brittle(adjective, firm, solid, tense) | |
| buckram(adjective, firm, solid, tense) | |
| cemented(adjective, firm, solid, tense) | |
| chilled(adjective, firm, solid, tense) | |
| concrete(tough, solid, rigid, inflexible) | |
| congealed(adjective, tough, firm, solid) | |
| contracted(adjective, firm, solid, tense) | |
| creaky(adjective, firm, solid, tense) | |
| drastic(adjective, severe, rough, harsh) | |
| ferocious(adjective, severe, rough, harsh) | |
| fierce(adjective, severe, rough, harsh) | |
| frozen(adjective, firm, solid, tense) | |
| graceless(adjective, firm, solid, tense) | |
| hardened(adjective, tough, firm, solid) | |
| heavy(tough, solid, rigid, inflexible) | |
| immalleable(adjective, firm, solid, stiff) | |
| immutable(adjective, severe, rough, harsh) | |
| impervious(tough, solid, rigid, inflexible) |
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Refractory on
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| APA | Smart Define. (2015). refractory thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/refractory/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "refractory thesaurus" https://smartdefine.org/refractory/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, refractory thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/refractory/thesaurus/synonyms>. |
| MLA | Smart Define. "refractory thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/refractory/thesaurus/synonyms> |