147 entries under fundamental topic. ×

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concealed(adjective, original, primary, latent)
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de rigueur(expression, adjective, significant, essential, vital)
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empyreal(adjective, essential, supreme)
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empyrean(adjective, essential, supreme)
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essential element(noun, expression, shorts, undercarriage)
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exigent(adjective, significant, essential, vital)
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expedient(adjective, significant, essential, vital)
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fire and ice(noun, expression, idiom, condition, essence)
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hidden(adjective, original, primary, latent)
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incomparable(adjective, essential, prime, key)
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incumbent on(expression, adjective, significant, essential, vital)
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larval(simple, elementary)
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lifeblood(noun, essential, necessity, quintessence)
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lurking(adjective, original, primary, latent)
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max(adjective, essential, supreme)
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maxi(adjective, essential, supreme)
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maximum(adjective, essential, prime, key)
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most(adjective, essential, supreme)
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nitty gritty(noun, expression, shorts, undercarriage)
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no-frills(noun, adjective, ordinary, mediocre)
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APASmart Define. (2015). basic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/basic/thesaurus/synonyms
ChicagoSmart Define. 2015. "basic thesaurus" https://smartdefine.org/basic/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, basic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/basic/thesaurus/synonyms>.
MLASmart Define. "basic thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/basic/thesaurus/synonyms>