149 entries under important topic. ×
| firm(adjective, strong, hard, tough, severe) | |
| hot(adjective, great, keen, warm, intense) | |
| strong(adjective, hard, tough, firm, solid) | |
| capital(adjective, severe, significant, critical) | |
| central(adjective, significant, basic, prime) | |
| eminent(adjective, unusual, outstanding, prominent) | |
| fundamental | |
| major-league(adjective, great, extraordinary, unusual) | |
| powerful(adjective, good, significant, prominent) | |
| prominent(adjective, good, great, unusual) | |
| sound(adjective, calm, strong, honest, solid) | |
| telling(adjective, expressive, eloquent, evocative) | |
| arch(adjective, prominent, greatness, exalted) | |
| dominant | |
| earthshaking | |
| epoch-making | |
| eventful(great, extraordinary, unusual, significant) | |
| exalted(adjective, significant, critical, prominent) | |
| extraordinary(adjective, great, unusual, famous) | |
| monumental(great, extraordinary, outstanding, notable) |
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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> |