22 entries under serious topic. ×

24
crucial(adjective, important, significant, critical)
24
important(adjective, important, significant, critical)
20
momentous(adjective, feature, state, characteristic, important)
18
critical(adjective, important, significant, vital)
14
vital(adjective, important, significant, critical)
12
decisive(adjective, important, significant, critical)
11
main(adjective, important, significant, basic)
11
overriding(adjective, feature, state, characteristic, important)
11
principal(adjective, important, basic, prime)
10
chief(adjective, important, significant, prime)
10
significant(adjective, important, critical, vital)
7
cardinal(noun, adjective, important, significant)
7
grave(adjective, important, significant, vital)
7
overruling(adjective, important, basic, prime)
5
consequential(adjective, important, significant, critical)
4
ruling(adjective, important, significant, basic)
4
weighty(adjective, important, significant, vital)
3
leading(adjective, feature, state, characteristic, important)
1
earth-shaking(adjective, important, significant, critical)
1
earth-shattering(important, significant, critical, historic)
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APASmart Define. (2016). pivotal thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/pivotal/thesaurus/synonyms
ChicagoSmart Define. 2016. "pivotal thesaurus" https://smartdefine.org/pivotal/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, pivotal thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/pivotal/thesaurus/synonyms>.
MLASmart Define. "pivotal thesaurus" 29 March 2016. Web. 30 September 2026. <https://smartdefine.org/pivotal/thesaurus/synonyms>