58 entries under original topic. ×

1
radical(adjective, important, significant, essential)
1
rudimentary(adjective, important, significant, essential)
1
structural(material, important, natural, basic)
1
substratal(adjective, important, significant, essential)
1
substrative(adjective, important, significant, essential)
1
supporting(adjective, important, significant, essential)
1
sustaining(adjective, important, significant, essential)
1
theoretical(adjective, important, significant, essential)
1
underived(adjective, important, significant, essential)
0
concealed(adjective, basic, fundamental, hidden)
0
deep(basic, primary)
0
deep-seated(basic, primary)
0
hidden(adjective, basic, fundamental, primary)
0
latent(adjective, basic, fundamental, hidden)
0
lurking(adjective, basic, fundamental, hidden)
0
nub(adjective, basic, fundamental, primary)
0
root(adjective, basic, fundamental, hidden)
0
veiled(adjective, basic, fundamental, hidden)
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APASmart Define. (2015). necessary thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 26 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms>