64 entries under serious topic. ×

8
major(adjective, great, heavy, important, significant)
8
paramount(adjective, importance, important, significant, original)
7
decisive(adjective, severe, big, important, significant)
7
life-and-death(adjective, heavy, important, critical)
6
compelling(adjective, energetic, important, lively, active)
6
radical(adjective, great, importance, important, significant)
5
capital(adjective, top, importance, important)
5
exigent(adjective, big, heavy, important, significant)
3
burning(adjective, important, essential, critical)
3
foremost(adjective, importance, big, important, significant)
3
leading(adjective, top, importance, important)
3
overruling(adjective, importance, essential, basic)
2
acute(adjective, severe, heavy, important, significant)
2
all-important(adjective, important, significant, essential)
2
dangerous(great, severe, important, significant)
2
wanted(adjective, important, significant, essential)
1
clamant(adjective, important, essential, critical)
1
clamorous(adjective, important, essential, critical)
1
conclusive(adjective, significant, last, critical)
1
crying(adjective, important, essential, critical)
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APASmart Define. (2015). vital thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/vital/thesaurus/synonyms
ChicagoSmart Define. 2015. "vital thesaurus" https://smartdefine.org/vital/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, vital thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/vital/thesaurus/synonyms>.
MLASmart Define. "vital thesaurus" 2 November 2015. Web. 29 September 2026. <https://smartdefine.org/vital/thesaurus/synonyms>