149 entries under important topic. ×
| necessary(adjective, big, significant, substantial) | |
| primary(big, significant, substantial, valuable) | |
| principal(great, big, significant, substantial) | |
| salient(adjective, big, significant, substantial) | |
| signal(great, extraordinary, outstanding, significant) | |
| solid(adjective, strong, big, pure) | |
| world-shaking | |
| big-name | |
| big-wig | |
| boss(adjective, unusual, exceptional, remarkable) | |
| cardinal | |
| chief(adjective, great, big, heavy) | |
| conspicuous(adjective, great, unusual, famous) | |
| demanding(adjective, hard, tough, difficult, harsh) | |
| determining(big, significant, substantial, valuable) | |
| enduring(adjective, great, complete, warm, total) | |
| evident(adjective, great, extraordinary, unusual) | |
| exacting(adjective, hard, tough, severe, rough) | |
| exceptional(adjective, great, big, unusual, heavy) | |
| exigent(adjective, hard, tough, difficult, big) |
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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> |