95 entries under strong topic. ×
| dense(adjective, set, hard, tough) | |
| unbreakable(adjective, hard, severe, firm) | |
| hardened(adjective, hard, tough, firm) | |
| sturdy(adjective, close, set, hard) | |
| astringent(adjective, hard, tough, severe) | |
| authoritarian(adjective, hard, tough, severe) | |
| compact(adjective, close, set, hard) | |
| compressed(adjective, set, hard, tough) | |
| hard-core(adjective, hard, tough, severe) | |
| indomitable(adjective, hard, tough, resolute) | |
| rugged(adjective, hard, tough, severe) | |
| thick(adjective, hard, tough, firm) | |
| unsparing(adjective, hard, tough, severe) | |
| hard-shell(adjective, hard, tough, severe) | |
| impenetrable(adjective, set, hard, tough) | |
| serious(adjective, hard, tough, severe) | |
| bitter(adjective, set, hard, tough) | |
| concentrated(adjective, set, hard, complete) | |
| fit(adjective, hard, solid, stiff) | |
| hard-boiled(adjective, mean, hard, tough) |
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| APA | Smart Define. (2015). rigid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, rigid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>. |
| MLA | Smart Define. "rigid thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms> |