55 entries under original topic. ×

65
important(adjective, great, tough, severe, extraordinary)
46
vital(adjective, great, severe, big, heavy)
40
essential(adjective, severe, big, important, significant)
22
necessary(adjective, big, important, significant)
19
significant(adjective, great, tough, severe, extraordinary)
18
fundamental(adjective, important, significant, capital)
17
key(adjective, important, significant, essential)
16
major(adjective, great, tough, severe, heavy)
15
basic(adjective, important, significant, essential)
13
central(adjective, important, significant, critical)
12
main(adjective, important, significant, capital)
10
indispensable(adjective, important, significant, serious)
6
cardinal(adjective, important, significant, essential)
6
primary(adjective, big, important, significant)
6
principal(adjective, great, big, important, significant)
6
requisite(adjective, important, significant, essential)
4
underlying(adjective, important, basic, vital)
3
elementary(adjective, important, significant, essential)
3
needful(adjective, important, significant, capital)
3
paramount(adjective, important, significant, serious)
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APASmart Define. (2016). crucial thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/crucial/thesaurus/synonyms
ChicagoSmart Define. 2016. "crucial thesaurus" https://smartdefine.org/crucial/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, crucial thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/crucial/thesaurus/synonyms>.
MLASmart Define. "crucial thesaurus" 11 March 2016. Web. 29 September 2026. <https://smartdefine.org/crucial/thesaurus/synonyms>