94 entries under essential topic. ×

2
compelling(adjective, important, significant, serious)
2
imperative(adjective, big, important, significant, substantial)
2
inherent(adjective, material, natural, basic)
2
integral(adjective, body, material, important, significant)
2
intrinsic(adjective, important, significant, original)
2
needful(adjective, important, significant, original, capital)
2
primitive(adjective, body, material, important, significant)
2
required(adjective, important, significant, serious, capital)
2
urgent(adjective, great, big, significant, substantial)
1
axiological(adjective, important, significant, original)
1
bottom(adjective, important, significant, original)
1
bottom-line(adjective, important, significant, original)
1
decisive(adjective, great, big, important, significant)
1
exigent(adjective, big, significant, substantial, large)
1
factor(basic, representative, operative, manager)
1
foundational(adjective, important, significant, original)
1
grass-roots(adjective, important, significant, original)
1
meat-and-potatoes(adjective, important, significant, original)
1
needed(adjective, important, significant, capital)
1
prerequisite(adjective, important, significant, capital)
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APASmart Define. (2016). principal thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/principal/thesaurus/synonyms
ChicagoSmart Define. 2016. "principal thesaurus" https://smartdefine.org/principal/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, principal thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/principal/thesaurus/synonyms>.
MLASmart Define. "principal thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/principal/thesaurus/synonyms>