55 entries under original topic. ×

1
substratal(adjective, important, significant, essential)
1
substrative(important, significant, basic, vital)
1
supporting(important, significant, basic, vital)
1
sustaining(important, significant, basic, vital)
1
theoretical(important, significant, basic, vital)
1
underived(important, significant, basic, vital)
0
concealed(adjective, basic, fundamental, hidden)
0
core(fundamental, key, chief, 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. (2016). crucial thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/crucial/thesaurus/synonyms
ChicagoSmart Define. 2016. "crucial thesaurus" https://smartdefine.org/crucial/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, crucial thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/crucial/thesaurus/synonyms>.
MLASmart Define. "crucial thesaurus" 11 March 2016. Web. 30 September 2026. <https://smartdefine.org/crucial/thesaurus/synonyms>