121 entries under rigid topic. ×
| thick(adjective, person, set, body, strong) | |
| aloof(adjective, calm, mean, hard, cool) | |
| concrete(adjective, hard, solid, inflexible) | |
| extreme(adjective, hard, harsh, rude, cruel) | |
| hard as nails(expression, adjective, idiom, strong, hard) | |
| immovable(adjective, mean, strong, hard, determined) | |
| inelastic(adjective, hard, determined, resolute) | |
| set in stone(expression, adjective, idiom, calm, mean) | |
| taut(adjective, rough, obstinate) | |
| unchangeable(adjective, calm, strong, solid, substantial) | |
| dour(adjective, hard, severe, sharp, firm) | |
| forbidding(adjective, strong, hard, severe, firm) | |
| impervious(noun, adjective, set, strong, hard) | |
| iron(adjective, mean, strong, hard, firm) | |
| compressed(adjective, set, hard, firm, solid) | |
| condensed(adjective, hard, solid, inflexible) | |
| exact(adjective, complete, full, careful) | |
| finicky(adjective, difficult, harsh, awkward, grim) | |
| indurate(adjective, mean, hard, firm, harsh) | |
| jelled(hard, solid, inflexible) |
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| APA | Smart Define. (2016). tough thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/tough/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "tough thesaurus" https://smartdefine.org/tough/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, tough thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/tough/thesaurus/synonyms>. |
| MLA | Smart Define. "tough thesaurus" 30 March 2016. Web. 28 September 2026. <https://smartdefine.org/tough/thesaurus/synonyms> |