93 entries under basic topic. ×

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bottom line(expression, important, significant, essential)
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concealed(adjective, original, fundamental, hidden)
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deep(original, primary)
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deep-seated(original, primary)
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hidden(adjective, original, fundamental, primary)
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latent(adjective, original, fundamental, hidden)
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lurking(adjective, original, fundamental, hidden)
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natural(material, living, functional, nuclear)
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nub(adjective, original, fundamental, primary)
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predominant(key, main, chief, foremost)
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root(adjective, original, fundamental, hidden)
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rooter(fundamental, latent)
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veiled(adjective, original, fundamental, hidden)
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APASmart Define. (2015). necessary thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 20 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms>