| hard as nails(expression, adjective, idiom, tough, firm) | |
| hardened(adjective, hard, tough, firm, solid) | |
| harsh | |
| hold the fort(expression, adjective, idiom, tough, firm) | |
| hold the line(expression, adjective, idiom, tough, firm) | |
| immalleable(adjective, hard, firm, solid, stiff) | |
| implacable | |
| indurate(adjective, hard, firm, solid, stiff) | |
| inelasticity | |
| inextensile | |
| inextensional | |
| insistent(adjective, determined, resolute, obstinate, uncompromising) | |
| intractile | |
| invariable | |
| iron | |
| irreconcilable | |
| jelled(adjective, hard, tough, firm, solid) | |
| locked in(expression, adjective, tough, severe, firm) | |
| malleable(adjective, softness) | |
| mechanical(adjective, hard, firm, solid, stiff) |
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| APA | Smart Define. (2015). inelastic thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/inelastic/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "inelastic thesaurus" https://smartdefine.org/inelastic/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, inelastic thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/inelastic/thesaurus/synonyms>. |
| MLA | Smart Define. "inelastic thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/inelastic/thesaurus/synonyms> |