84 entries under fundamental topic. ×

2
most(adjective, adverb, big, large, essential)
2
substratal(adjective, simple, plain, important, significant)
1
absolute(adjective, essential, basic, prime)
1
bottom-line(adjective, important, significant, original, essential)
1
complete(adjective, exact, precise, basic, absolute)
1
congenital(adjective, basic, absolute, key)
1
deep-seated(adjective, original, essential, basic, absolute)
1
inborn(adjective, basic, absolute, key)
1
innate(adjective, body, material, natural, animate)
1
meat-and-potatoes(adjective, base, important, significant, last)
1
meat and potatoes(expression, adjective, idiom, simple, plain)
1
nitty-gritty(adjective, original, basic, absolute)
1
nub(adjective, original, basic, absolute)
1
root(adjective, original, basic, latent)
1
simplest(simple, straightforward, basic, uncomplicated)
1
undeveloped(simple, basic, first, unsophisticated)
1
vestigial(simple, basic, unsophisticated, elementary)
0
categorical(adjective, essential, supreme)
0
cold(adjective, basic, absolute, key)
0
concealed(adjective, original, basic, latent)
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APASmart Define. (2016). primary thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/primary/thesaurus/synonyms
ChicagoSmart Define. 2016. "primary thesaurus" https://smartdefine.org/primary/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, primary thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/primary/thesaurus/synonyms>.
MLASmart Define. "primary thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/primary/thesaurus/synonyms>