66 entries under essential topic. ×

1
deep-seated(adjective, original, basic, absolute)
1
grass-roots(adjective, important, significant, original)
1
inbred(adjective, basic, absolute, fundamental)
1
leading(adjective, top, prime, vital)
1
major(adjective, important, significant, original)
1
meat-and-potatoes(adjective, base, important, significant, last)
1
paramount(adjective, important, significant, original)
1
predominant(adjective, main, central)
1
primordial(adjective, rough, important, significant, original)
1
requisite(adjective, important, significant, original)
1
significant(adjective, important, original, basic)
1
substrative(adjective, important, significant, original)
1
supporting(adjective, important, significant, original)
1
sustaining(adjective, important, significant, original)
1
theoretical(adjective, important, significant, original)
1
underived(adjective, rough, important, significant, original)
0
bottom line(expression, important, significant, basic)
0
controlling(adjective, main, central)
0
core(adjective, original, basic, fundamental)
0
dominant(adjective, top, prime, vital)
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APASmart Define. (2015). underlying thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/underlying/thesaurus/synonyms
ChicagoSmart Define. 2015. "underlying thesaurus" https://smartdefine.org/underlying/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, underlying thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/underlying/thesaurus/synonyms>.
MLASmart Define. "underlying thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/underlying/thesaurus/synonyms>