89 entries under notable topic. ×
| essential(adjective, severe, importance, big, important) | |
| fateful(adjective, importance, valuable, main) | |
| impressive(adjective, importance, valuable, main) | |
| influential(adjective, good, great, importance, important) | |
| outstanding(adjective, great, importance, unusual, important) | |
| purposeful(adjective, firm, importance, resolute, valuable) | |
| responsible(adjective, importance, valuable, main) | |
| terrible(adjective, bad, great, difficult, extraordinary) | |
| big-league(adjective, importance, valuable, main) | |
| remarkable(adjective, importance, unusual, important, famous) | |
| challenging(adjective, hard, tough, difficult, importance) | |
| newsworthy(adjective, importance, important, valuable, main) | |
| big shot(adjective, importance, valuable, main) | |
| bigwig(adjective, importance, valuable, main) | |
| constitutive(adjective, importance, valuable, main) | |
| decisive(adjective, great, severe, firm, extraordinary) | |
| donnish(adjective, importance, valuable, main) | |
| exciting(adjective, importance, valuable, main) | |
| far reaching(adjective, importance, valuable, main) | |
| haughty(adjective, importance, valuable, main) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 24 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |