30 entries under hard topic. ×
| compact(solid, rigid) | |
| dense(solid, rigid) | |
| heavy(tough, solid, rigid, inflexible) | |
| impenetrable(solid, rigid) | |
| impermeable(solid, rigid) | |
| inflexible(tough, solid, rigid) | |
| rigid(tough, solid, inflexible) | |
| solid | |
| substantial(solid, rigid) | |
| tough(solid, rigid, inflexible) |
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| APA | Smart Define. (2015). fine-grained thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/fine-grained/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fine-grained thesaurus" https://smartdefine.org/fine-grained/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, fine-grained thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/fine-grained/thesaurus/synonyms>. |
| MLA | Smart Define. "fine-grained thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/fine-grained/thesaurus/synonyms> |