32 entries under simple topic. ×

23
fundamental(adjective, plain, important, straightforward)
22
basic(adjective, plain, base, important)
20
essential(adjective, plain, important, significant)
15
primary(adjective, plain, base, important)
15
elementary(adjective, plain, important, significant)
13
elemental(adjective, plain, important, significant)
9
rudimentary(adjective, plain, important, significant)
8
basal(adjective, plain, base, important)
8
primitive(adjective, plain, important, significant)
6
foundational(adjective, plain, base, important)
5
original(adjective, plain, important, significant)
2
substratal(adjective, plain, important, significant)
1
ABCs(straightforward, basic, uncomplicated)
1
abecedarian(straightforward, basic, uncomplicated)
1
beginning(straightforward, basic, uncomplicated)
1
clear(straightforward, basic, uncomplicated)
1
duck soup(expression, straightforward, basic, uncomplicated)
1
easy(straightforward, basic, uncomplicated)
1
facile(straightforward, basic, uncomplicated)
1
initial(top, straightforward, basic, first)
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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>