51 entries under basic topic. ×

1
essential(adjective, simple, rough, important, significant)
1
foundational(adjective, important, significant, fresh, original)
1
grass-roots(adjective, important, significant, original, essential)
1
indispensable(adjective, important, significant, original, essential)
1
integral(adjective, important, significant, original, essential)
1
intrinsic(adjective, important, significant, original, essential)
1
key(adjective, important, significant, original, essential)
1
major(adjective, important, significant, original, essential)
1
meat-and-potatoes(adjective, important, significant, fresh, original)
1
necessary(adjective, important, significant, original, essential)
1
paramount(adjective, important, significant, original, essential)
1
primordial(adjective, rough, important, significant, original)
1
principal(adjective, important, significant, original, essential)
1
pristine(adjective, simple, authentic, first)
1
radical(adjective, important, significant, original, essential)
1
requisite(adjective, important, significant, original, essential)
1
rudimentary(adjective, rough, important, significant, fresh)
1
significant(adjective, important, original, essential)
1
structural(adjective, important, significant, original)
1
substratal(adjective, rough, important, significant, fresh)
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APASmart Define. (2015). underived thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/underived/thesaurus/synonyms
ChicagoSmart Define. 2015. "underived thesaurus" https://smartdefine.org/underived/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, underived thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/underived/thesaurus/synonyms>.
MLASmart Define. "underived thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/underived/thesaurus/synonyms>