115 entries under heavy topic. ×
| grave(adjective, calm, dull, quiet, help) | |
| severe(adjective, calm, help, bad, strong) | |
| weighty(adjective, good, dull, hard, great) | |
| solemn(adjective, calm, dull, quiet, cool) | |
| important(adjective, good, great, severe, extraordinary) | |
| earnest(noun, adjective, calm, dull, work) | |
| critical(adjective, hard, great, tough, severe) | |
| significant(adjective, good, great, extraordinary, importance) | |
| sober(adjective, calm, dull, quiet, cool) | |
| grievous(adjective, help, hard, great, tough) | |
| momentous(adjective, good, great, severe, extraordinary) | |
| consequential(adjective, good, harsh, importance, big) | |
| sedate(adjective, calm, dull, cool, severe) | |
| staid(adjective, calm, dull, set, cool) | |
| burdensome(adjective, hard, difficult, big) | |
| vital(adjective, great, severe, importance, big) | |
| substantial(adjective, importance, big, important) | |
| pressing(adjective, hard, tough, difficult, big) | |
| crucial(adjective, great, severe, extraordinary, big) | |
| meaningful(adjective, good, great, severe, extraordinary) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 25 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |