85 entries under basic topic. ×

1
primo(simple, straightforward, uncomplicated)
1
primordial(adjective, rough, important, significant, original)
1
requisite(adjective, important, significant, original, essential)
1
significant(adjective, important, original, essential)
1
simple(top, straightforward, first, unsophisticated)
1
simplest(simple, straightforward, uncomplicated)
1
simplex(simple, straightforward, uncomplicated)
1
simplified(simple, straightforward, uncomplicated)
1
structural(important, original, vital, primary)
1
substrative(adjective, important, significant, original, essential)
1
supporting(adjective, important, significant, original, essential)
1
sustaining(adjective, important, significant, original, essential)
1
theoretical(adjective, important, significant, original, essential)
1
uncomplex(simple, straightforward, uncomplicated)
1
uncomplicated(simple, straightforward, unsophisticated)
1
underived(adjective, rough, important, significant, original)
0
absolute(adjective, fundamental, key, central)
0
bottom line(expression, important, significant, essential)
0
cold(adjective, absolute, fundamental, key)
0
complete(adjective, absolute, fundamental, key)
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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>