75 entries under essential topic. ×

2
elemental(adjective, important, significant, original)
2
instant(adjective, important, serious, critical)
2
mandatory(adjective, significant, basic, vital)
2
primitive(adjective, important, significant, original)
1
bottom(adjective, important, significant, original)
1
capital(adjective, important, serious, critical)
1
clamant(adjective, important, serious, critical)
1
coal-and-ice(important, critical, basic, fundamental)
1
constitutive(important, significant, capital, critical)
1
foremost(important, significant, capital, vital)
1
importunate(adjective, big, important, significant, substantial)
1
integral(important, significant, serious, critical)
1
intrinsic(adjective, important, significant, original)
1
leading(adjective, important, serious, capital)
1
meat-and-potatoes(important, significant, original, critical)
1
name(important, critical, fundamental, imperative)
1
name-of-the-game(important, critical, basic, fundamental)
1
necessitous(important, capital, vital, fundamental)
1
nitty-gritty(adjective, important, original, critical)
1
prerequisite(adjective, important, significant, capital)
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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>