79 entries under hard topic. ×
| thickened(adjective, firm, solid, tense) | |
| unflexible(adjective, firm, solid, tense) | |
| ungraceful(adjective, firm, solid, tense) | |
| unsupple(adjective, firm, solid, tense) | |
| vicious(adjective, severe, rough, harsh) | |
| wooden(adjective, firm, solid, tense) | |
| close(tough, solid, rigid, inflexible) | |
| close-grained(tough, solid, rigid, inflexible) | |
| compact(solid, rigid) | |
| compressed(tough, solid, rigid, inflexible) | |
| concentrated(tough, solid, rigid, inflexible) | |
| condensed(tough, solid, rigid, inflexible) | |
| dense(solid, rigid) | |
| fine-grained(tough, solid, rigid, inflexible) | |
| impenetrable(solid, rigid) | |
| impermeable(solid, rigid) | |
| narrow(adjective, severe, rough, harsh) | |
| nonporous(tough, solid, rigid, inflexible) | |
| terrible(adjective, severe, rough, harsh) |
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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> |