40 entries under significant topic. ×

4
indispensable(adjective, important, original, essential)
4
key(adjective, important, original, essential)
4
necessary(adjective, important, original, essential)
3
integral(adjective, important, original, essential)
2
first(adjective, rough, important, original)
2
important(adjective, original, essential, basic)
2
substratal(adjective, simple, plain, important)
1
axiological(adjective, important, original, essential)
1
grass-roots(adjective, important, original, essential)
1
major(adjective, important, original, essential)
1
meat-and-potatoes(adjective, base, important, last)
1
paramount(adjective, important, original, essential)
1
primordial(adjective, rough, important, original)
1
requisite(adjective, important, original, essential)
1
substrative(adjective, important, original, essential)
1
supporting(adjective, important, original, essential)
1
sustaining(adjective, important, original, essential)
1
theoretical(adjective, important, original, essential)
1
underived(adjective, rough, important, original)
0
bottom line(expression, important, essential, basic)
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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>