159 entries under rigid topic. ×
| heavy(adjective, set, strong, hard, sound) | |
| unswayable(adjective, determined, resolute, obstinate) | |
| callous(verb, adjective, close, set, fix) | |
| hanging tough(expression, adjective, mean, hard, determined) | |
| indurate(verb, adjective, close, set, fix) | |
| intractable(adjective, tough, persistent, inflexible) | |
| rigorous(adjective, strong, hard, complete, tough) | |
| harsh(adjective, mean, strong, hard, tough) | |
| impervious(adjective, set, strong, hard, tough) | |
| pat(adjective, solid, determined, usual, steady) | |
| unbreakable(adjective, strong, hard, tough, severe) | |
| consolidated(adjective, close, set, hard, solid) | |
| hardened(adjective, set, strong, hard, tough) | |
| impermeable(adjective, close, hard, solid, fast) | |
| incompliant(adjective, tough, solid, determined, stiff) | |
| ironclad(adjective, set, hard, usual, regular) | |
| petrified(adjective, calm, set, strong, hard) | |
| rocky(adjective, set, strong, hard, difficult) | |
| solidified(adjective, set, hard, solid, heavy) | |
| austere(adjective, strong, hard, tough, severe) |
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| APA | Smart Define. (2016). firm thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/firm/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "firm thesaurus" https://smartdefine.org/firm/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, firm thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/firm/thesaurus/synonyms>. |
| MLA | Smart Define. "firm thesaurus" 31 March 2016. Web. 26 September 2026. <https://smartdefine.org/firm/thesaurus/synonyms> |