133 entries under adjective topic. ×

2
deep(original, basic, primary)
2
first(rough, important, significant, original)
2
important(significant, original, essential, basic)
2
inborn(essential, basic, absolute, fundamental)
2
innate(essential, basic, absolute, fundamental)
2
lowest(base, last, bottom)
2
lurking(fundamental, latent)
2
material(essential, basic, absolute, fundamental)
2
natural
2
needful(fundamental, latent)
2
profound
2
root(fundamental, latent)
2
subconscious
2
substratal(simple, plain, important, significant)
2
ulterior
2
veiled(fundamental, latent)
1
axiological(important, significant, original, essential)
1
bottom-line(important, original, basic, vital)
1
connate(essential, basic, absolute, fundamental)
1
deep-rooted
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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>