127 entries under tough topic. ×
| distressing(adjective, severe, rough, difficult) | |
| firm(adjective, strong, hard, severe) | |
| relentless(adjective, close, strong, hard) | |
| rigid(adjective, strong, hard, severe) | |
| strong(adjective, hard, firm, solid) | |
| dull(adjective, severe, dark, gloomy) | |
| frowning(adjective, strong, hard, severe) | |
| practical(adjective, calm, plain, dark) | |
| unbending(adjective, close, strong, hard) | |
| unyielding(adjective, strong, hard, severe) | |
| bullheaded(adjective, strong, hard, severe) | |
| deadpan(adjective, set, severe, honest) | |
| forbidding(adjective, close, strong, hard) | |
| harsh(adjective, strong, hard, severe) | |
| impassive(adjective, calm, restrained, rational) | |
| implacable(adjective, strong, hard, severe) | |
| indomitable(adjective, strong, hard, resolute) | |
| inexorable(adjective, close, strong, hard) | |
| realistic(adjective, calm, sensible, dark) | |
| rigorous(adjective, strong, hard, severe) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 29 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |