58 entries under original topic. ×

5
primary(adjective, body, material, big, important)
4
basal(adjective, body, material, important, significant)
4
underlying(adjective, important, significant, essential)
3
bottom-line(adjective, important, significant, essential)
3
elemental(adjective, body, material, important, significant)
3
intrinsic(adjective, important, significant, essential)
3
primitive(adjective, body, material, important, significant)
2
bottom(adjective, important, significant, essential)
2
core(fundamental, key, main, chief)
1
axiological(adjective, important, significant, essential)
1
axiomatic(important, significant, basic, vital)
1
constitutional(adjective, body, material, important, significant)
1
constitutive(important, capital, essential, critical)
1
first(adjective, important, significant, essential)
1
foundational(adjective, important, significant, essential)
1
grass-roots(adjective, important, significant, essential)
1
major(adjective, important, significant, essential)
1
meat-and-potatoes(adjective, important, significant, essential)
1
nitty-gritty(adjective, important, essential, critical)
1
primordial(adjective, important, significant, essential)
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APASmart Define. (2015). necessary thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 25 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms>