118 entries under significant topic. ×
| eventful(great, extraordinary, unusual, important) | |
| exalted(adjective, important, critical, prominent) | |
| extensive(big, substantial, large, valuable) | |
| extraordinary(adjective, great, unusual, important, famous) | |
| hazardous(adjective, bad, severe, heavy) | |
| large(big, substantial, valuable, vital) | |
| necessary(adjective, big, important, substantial) | |
| primary(big, important, substantial, valuable) | |
| principal(great, big, important, substantial) | |
| salient(adjective, big, important, substantial) | |
| signal(great, extraordinary, important, outstanding) | |
| solid(adjective, strong, big, pure, important) | |
| chief(adjective, great, big, heavy, important) | |
| conspicuous(adjective, great, unusual, important, famous) | |
| determining(big, important, substantial, valuable) | |
| enduring(adjective, great, complete, warm, total) | |
| esteemed(grand, vital, imperative, respected) | |
| exceptional(adjective, great, big, unusual, heavy) | |
| exigent(adjective, hard, tough, difficult, big) | |
| far-reaching(adjective, big, important, substantial) |
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| APA | Smart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>. |
| MLA | Smart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms> |