89 entries under notable topic. ×
| grave(adjective, calm, dull, quiet, help) | |
| 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) | |
| momentous(adjective, good, great, severe, extraordinary) | |
| consequential(adjective, good, harsh, importance, big) | |
| heavy(adjective, strong, hard, great, tough) | |
| vital(adjective, great, severe, importance, big) | |
| substantial(adjective, importance, big, heavy, important) | |
| crucial(adjective, great, severe, extraordinary, big) | |
| grand(adjective, importance, valuable, main, greatness) | |
| great(adjective, importance, valuable, main) | |
| meaningful(adjective, good, great, severe, extraordinary) | |
| big(adjective, good, importance, heavy, important) | |
| material(adjective, good, importance, big, heavy) | |
| portentous(adjective, importance, valuable, main) | |
| key(adjective, importance, important, valuable, main) |
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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> |