64 entries under serious topic. ×

66
important(adjective, great, severe, importance, heavy)
63
essential(adjective, body, severe, importance, material)
44
critical(adjective, great, severe, big, heavy)
27
crucial(adjective, great, severe, big, heavy)
27
necessary(adjective, body, material, big, important)
24
indispensable(adjective, important, significant, original)
20
momentous(adjective, severe, importance, big, heavy)
20
urgent(adjective, severe, big, heavy, important)
18
imperative(adjective, big, important, significant, substantial)
16
significant(adjective, great, importance, big, heavy)
15
integral(adjective, body, importance, material, important)
15
weighty(adjective, great, severe, importance, big)
14
pivotal(adjective, important, significant, critical)
12
consequential(adjective, importance, heavy, important, significant)
11
required(adjective, important, significant, essential)
11
pressing(adjective, big, heavy, important, significant)
10
influential(adjective, great, energetic, importance, important)
10
outstanding(adjective, great, importance, important, significant)
10
principal(adjective, body, great, importance, material)
8
chief(adjective, importance, big, important, significant)
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APASmart Define. (2015). vital thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/vital/thesaurus/synonyms
ChicagoSmart Define. 2015. "vital thesaurus" https://smartdefine.org/vital/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, vital thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/vital/thesaurus/synonyms>.
MLASmart Define. "vital thesaurus" 2 November 2015. Web. 28 September 2026. <https://smartdefine.org/vital/thesaurus/synonyms>