119 entries under severe topic. ×
| implacable(adjective, strong, hard, tough) | |
| inexorable(adjective, close, strong, hard, tough) | |
| loathsome(adjective, bad, offensive, intense) | |
| rigorous(adjective, strong, hard, tough) | |
| steely(adjective, strong, hard, tough) | |
| strict(adjective, strong, hard, tough) | |
| unpleasant(adjective, harsh, intense, terrible) | |
| vile(adjective, intense, unpleasant, horrible) | |
| onerous(adjective, hard, tough, rough) | |
| astringent(adjective, close, strong, hard, tough) | |
| authoritarian(adjective, strong, hard, tough) | |
| bitter(adjective, strong, hard, tough) | |
| close(adjective, hard, harsh, cold) | |
| cold(adjective, calm, close, hard, tough) | |
| cold sober(expression, adjective, calm, set, cool) | |
| disciplinary(adjective, strong, hard, tough) | |
| dyed-in-the-wool(adjective, strong, hard, tough) | |
| effortful(adjective, hard, tough, rough) | |
| exacting(adjective, hard, tough, rough) | |
| exhausting(adjective, hard, tough, rough) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |