122 entries under hard topic. ×
| rigid(adjective, strong, tough, severe) | |
| strong(adjective, tough, firm, solid) | |
| violent(adjective, severe, rough, difficult) | |
| frowning(adjective, strong, tough, severe) | |
| unbending(adjective, close, strong, tough) | |
| unyielding(adjective, strong, tough, severe) | |
| bullheaded(adjective, strong, tough, severe) | |
| forbidding(adjective, close, strong, tough) | |
| harsh(adjective, strong, tough, severe) | |
| implacable(adjective, strong, tough, severe) | |
| indomitable(adjective, strong, tough, resolute) | |
| inexorable(adjective, close, strong, tough) | |
| rigorous(adjective, strong, tough, severe) | |
| steely(adjective, strong, tough, severe) | |
| strict(adjective, strong, tough, severe) | |
| onerous(adjective, tough, severe, rough) | |
| astringent(adjective, close, strong, tough) | |
| authoritarian(adjective, strong, tough, severe) | |
| bitter(adjective, strong, tough, severe) | |
| bothersome(adjective, tough, rough, difficult) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 27 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |