119 entries under severe topic. ×
| grave(adjective, calm, dull, quiet, help) | |
| weighty(adjective, good, dull, hard, great) | |
| solemn(adjective, calm, dull, quiet, cool) | |
| important(adjective, good, great, extraordinary) | |
| earnest(noun, adjective, calm, dull, work) | |
| critical(adjective, hard, great, tough) | |
| sad(adjective, hard, difficult, complex, importance) | |
| sober(adjective, calm, dull, quiet, cool) | |
| momentous(adjective, good, great, extraordinary) | |
| hard(adjective, strong, tough, easy) | |
| sedate(adjective, calm, dull, cool) | |
| staid(adjective, calm, dull, set, cool) | |
| grim(adjective, dull, strong, hard, tough) | |
| cruel(adjective, strong, hard, tough) | |
| hard-nosed(adjective, strong, hard, tough) | |
| heavy(adjective, strong, hard, great, tough) | |
| vital(adjective, great, importance, big) | |
| dangerous(adjective, help, bad, great) | |
| crucial(adjective, great, extraordinary, big) | |
| meaningful(adjective, good, great, extraordinary) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 23 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |