45 entries under important topic. ×

4
constitutional(adjective, significant, original, essential)
4
indispensable(adjective, significant, original, essential)
4
key(adjective, significant, original, essential)
4
necessary(adjective, significant, original, essential)
3
integral(adjective, significant, original, essential)
2
constitutive(original, essential, basic, vital)
2
first(adjective, rough, significant, original)
2
substratal(adjective, simple, plain, significant)
1
axiological(adjective, significant, original, essential)
1
axiomatic(original, basic, vital, primary)
1
bottom-line(adjective, original, basic, vital)
1
grass-roots(adjective, significant, original, essential)
1
major(adjective, significant, original, essential)
1
meat-and-potatoes(adjective, base, significant, last)
1
paramount(adjective, significant, original, essential)
1
primordial(adjective, rough, significant, original)
1
requisite(adjective, significant, original, essential)
1
significant(adjective, original, essential, basic)
1
structural(original, basic, vital, primary)
1
substrative(adjective, significant, original, essential)
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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>