191 entries under tough topic. ×
| indomitable(adjective, strong, hard, resolute) | |
| recalcitrant(adjective, firm, persistent, obstinate) | |
| rugged(adjective, strong, hard, severe) | |
| square(adjective, moderate, severe, firm) | |
| thick(adjective, strong, hard, firm) | |
| unsparing(adjective, strong, hard, severe) | |
| uptight(adjective, moderate, severe, firm) | |
| condensed(adjective, hard, solid, inflexible) | |
| hard-shell(adjective, strong, hard, severe) | |
| impenetrable(adjective, set, strong, hard) | |
| opinionated(adjective, firm, unreasonable, inflexible) | |
| self-willed(adjective, firm, inflexible, obstinate) | |
| serious(adjective, strong, hard, severe) | |
| straight(adjective, correct, moderate, severe) | |
| bitter(adjective, set, strong, hard) | |
| burdensome(adjective, correct, severe, harsh) | |
| cantankerous(firm, persistent, obstinate, stubborn) | |
| concentrated(adjective, set, strong, hard, complete) | |
| concrete(adjective, hard, correct, solid) | |
| hard-boiled(adjective, mean, strong, hard) |
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| APA | Smart Define. (2015). rigid thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, rigid thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>. |
| MLA | Smart Define. "rigid thesaurus" 3 August 2015. Web. 28 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms> |