97 entries under basic topic. ×

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bottom line(expression, important, significant, essential)
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concealed(adjective, original, fundamental, primary)
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de rigueur(expression, adjective, significant, essential)
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exigent(adjective, significant, essential, vital)
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expedient(adjective, significant, essential, vital)
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hidden(adjective, original, fundamental, primary)
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incumbent on(expression, adjective, significant, essential)
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latent(adjective, original, fundamental, primary)
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lurking(adjective, original, fundamental, primary)
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name of game(expression, adjective, idiom, significant, essential)
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obligatory(adjective, significant, essential, vital)
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pressing(adjective, significant, essential, vital)
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root(adjective, original, fundamental, primary)
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rooter(fundamental, latent)
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specified(adjective, significant, essential, vital)
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unavoidable(adjective, significant, essential, vital)
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veiled(adjective, original, fundamental, primary)
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APASmart Define. (2015). cardinal thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/cardinal/thesaurus/synonyms
ChicagoSmart Define. 2015. "cardinal thesaurus" https://smartdefine.org/cardinal/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, cardinal thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/cardinal/thesaurus/synonyms>.
MLASmart Define. "cardinal thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/cardinal/thesaurus/synonyms>