68 entries under simple topic. ×

48
basic(noun, adjective, characteristic, drop, part)
42
essential(noun, adjective, support, action, characteristic)
31
elementary(adjective, characteristic, plain, pure)
30
primary(adjective, body, plain, material)
28
elemental(adjective, body, plain, material)
21
underlying(adjective, plain, important, straightforward)
16
integral(noun, adjective, characteristic, part, body)
16
rudimentary(adjective, plain, important, head)
14
basal(adjective, body, plain, material)
12
original(adjective, characteristic, body, plain)
9
primitive(adjective, body, plain, material)
8
foundational(adjective, clear, plain, pure)
8
natural(adjective, characteristic, material, essential)
8
pure(adjective, pure, whole, united)
7
initial(adjective, start, plain, head)
7
monolithic(adjective, pure, whole, united)
6
indivisible(adjective, pure, whole, united)
6
irreducible(adjective, pure, whole, united)
6
plain(adjective, pure, straightforward, basic)
6
ultimate(adjective, essential, basic, surface)
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APASmart Define. (2016). fundamental thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fundamental/thesaurus/synonyms
ChicagoSmart Define. 2016. "fundamental thesaurus" https://smartdefine.org/fundamental/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, fundamental thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fundamental/thesaurus/synonyms>.
MLASmart Define. "fundamental thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/fundamental/thesaurus/synonyms>