64 entries under serious topic. ×
| desperate(severe, significant, critical, grave) | |
| determining(big, important, significant, substantial) | |
| dire(adjective, severe, heavy, important, significant) | |
| earth-shaking(important, significant, critical, historic) | |
| earth-shattering(important, significant, critical, historic) | |
| hazardous(adjective, heavy, significant, acute) | |
| importunate(adjective, big, important, significant, substantial) | |
| instant(adjective, important, essential, critical) | |
| life and death(expression, idiom, great, important) | |
| life or death(expression, adjective, idiom, important) | |
| major-league(great, important) | |
| perilous(adjective, heavy, significant, acute) | |
| preeminent(adjective, great, top, important) | |
| star(great, important, key, chief) | |
| stellar(great, important, key, chief) | |
| sudden | |
| afflictive(adjective, severe, heavy, acute) | |
| grievous(adjective, great, heavy, important, significant) | |
| heavyweight(great, important) | |
| highest(basic, prime, key, chief) |
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| APA | Smart Define. (2015). vital thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/vital/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "vital thesaurus" https://smartdefine.org/vital/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, vital thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/vital/thesaurus/synonyms>. |
| MLA | Smart Define. "vital thesaurus" 2 November 2015. Web. 29 September 2026. <https://smartdefine.org/vital/thesaurus/synonyms> |