94 entries under original topic. ×

12
first(adjective, order, violent, important, opening)
11
indispensable(adjective, characteristic, important, significant, natural)
11
requisite(noun, adjective, important, need, significant)
10
important(adjective, significant, essential, critical)
9
bottom(noun, adjective, cause, start, base)
9
primitive(adjective, body, simple, plain, material)
9
primordial(adjective, violent, important, head, beginning)
8
critical(adjective, severe, important, significant)
8
foundational(adjective, clear, simple, plain, pure)
7
initial(adjective, start, simple, plain, head)
7
paramount(adjective, important, significant, essential)
7
significant(adjective, important, essential, critical)
6
aboriginal(adjective, harsh, violent, pure, head)
6
major(adjective, important, significant, essential)
5
introductory(adjective, start, simple, plain, head)
5
leading(adjective, important, head, significant, beginning)
4
axiomatic(adjective, important, basic, primary)
4
beginning(noun, adjective, start, simple, plain)
4
incipient(adjective, head, beginning, opening)
4
nascent(adjective, start, pure, beginning, opening)
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APASmart Define. (2016). fundamental thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/fundamental/thesaurus/synonyms
ChicagoSmart Define. 2016. "fundamental thesaurus" https://smartdefine.org/fundamental/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, fundamental thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/fundamental/thesaurus/synonyms>.
MLASmart Define. "fundamental thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/fundamental/thesaurus/synonyms>