45 entries under original topic. ×

15
essential(adjective, characteristic, natural, basic)
15
intrinsic(adjective, characteristic, natural, fixed)
11
deep(adjective, great, obscure, down)
9
basic(adjective, characteristic, natural, essential)
7
elemental(adjective, characteristic, essential, basic)
6
constitutional(adjective, characteristic, natural, fixed)
5
radical(adjective, basic, fundamental, primary)
4
central(adjective, individual, essential, private)
3
fundamental(adjective, characteristic, fixed, essential)
1
basal(adjective, essential, basic, absolute)
1
cardinal(adjective, basic, absolute, fundamental)
1
elementary(adjective, characteristic, essential, basic)
1
indispensable(characteristic, essential, basic, primary)
1
integral(characteristic, essential, basic, primary)
1
key(adjective, essential, basic, absolute)
1
primary(adjective, essential, basic, absolute)
1
primitive(adjective, essential, basic, absolute)
1
principal(adjective, basic, absolute, fundamental)
1
rudimentary(adjective, basic, primary)
1
substratal(adjective, essential, basic, absolute)
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APASmart Define. (2016). deep-seated thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/deep-seated/thesaurus/synonyms
ChicagoSmart Define. 2016. "deep-seated thesaurus" https://smartdefine.org/deep-seated/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, deep-seated thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/deep-seated/thesaurus/synonyms>.
MLASmart Define. "deep-seated thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/deep-seated/thesaurus/synonyms>