30 entries under hard topic. ×
| compressed(verb, adjective, set, tough) | |
| concentrated(verb, adjective, set, strong) | |
| compact(adjective, close, set, tough) | |
| dense(adjective, set, tough, solid) | |
| thick(adjective, strong, tough, solid) | |
| solidified(verb, adjective, set, tough) | |
| close(adjective, set, tough, solid) | |
| firm(adjective, set, solid, heavy) | |
| solid(adjective, set, tough, heavy) | |
| impenetrable(adjective, set, tough, solid) | |
| hardened(adjective, tough, solid, rigid) | |
| heavy(adjective, set, tough, solid) | |
| concrete(adjective, set, tough, solid) | |
| inflexible(adjective, tough, solid, rigid) | |
| rigid(adjective, tough, solid, inflexible) | |
| stiff(adjective, set, tough, solid) | |
| unyielding(adjective, tough, solid, rigid) | |
| impermeable(adjective, set, tough, firm) | |
| inelastic(adjective, tough, solid, rigid) | |
| nonporous(tough, solid, rigid, inflexible) |
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| APA | Smart Define. (2015). condensed thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/condensed/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "condensed thesaurus" https://smartdefine.org/condensed/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, condensed thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/condensed/thesaurus/synonyms>. |
| MLA | Smart Define. "condensed thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/condensed/thesaurus/synonyms> |