51 entries under original topic. ×

4
constitutional(adjective, important, significant, essential)
4
indispensable(adjective, important, significant, essential)
4
key(adjective, important, significant, essential)
4
main(adjective, top, essential, basic)
4
necessary(adjective, important, significant, essential)
3
integral(adjective, important, significant, essential)
2
constitutive(important, essential, basic, vital)
2
deep(adjective, basic, primary)
2
first(adjective, rough, important, significant)
2
important(adjective, significant, essential, basic)
2
substratal(adjective, simple, plain, important, significant)
1
axiological(adjective, important, significant, essential)
1
axiomatic(important, basic, vital, primary)
1
bottom-line(adjective, important, basic, vital)
1
deep-seated(adjective, essential, basic, absolute)
1
grass-roots(adjective, important, significant, essential)
1
major(adjective, important, significant, essential)
1
meat-and-potatoes(adjective, base, important, significant, last)
1
nitty-gritty(adjective, basic, absolute, fundamental)
1
nub(adjective, basic, absolute, fundamental)
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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>