43 entries under hard topic. ×
| condensed(verb, adjective, set, tough) | |
| compact(adjective, set, tough, firm) | |
| solid(adjective, set, tough, firm) | |
| close(adjective, set, tough, slight) | |
| concentrated(verb, adjective, set, tough) | |
| dense(adjective, set, tough, firm) | |
| compacted(verb, adjective, set, strong) | |
| firm(adjective, set, solid, heavy) | |
| packed(verb, adjective, close, set, strong) | |
| impenetrable(adjective, set, tough, firm) | |
| thick(adjective, close, set, tough) | |
| stiff(adjective, set, tough, firm) | |
| concrete(adjective, set, tough, firm) | |
| heavy(adjective, set, tough, solid) | |
| rigid(adjective, set, strong, tough) | |
| inflexible(adjective, set, strong, tough) | |
| solidified(verb, adjective, set, tough) | |
| unyielding(adjective, set, tough, firm) | |
| hardened(verb, adjective, set, strong) | |
| impermeable(adjective, set, tough, firm) |
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| APA | Smart Define. (2016). compressed thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/compressed/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "compressed thesaurus" https://smartdefine.org/compressed/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2016, compressed thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/compressed/thesaurus/synonyms>. |
| MLA | Smart Define. "compressed thesaurus" 26 February 2016. Web. 21 September 2026. <https://smartdefine.org/compressed/thesaurus/synonyms> |