45 entries under required topic. ×

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pressing(adjective, significant, essential, basic, vital)
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quintessential(adjective, significant, essential, basic, vital)
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requisite(adjective, significant, essential, basic, vital)
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specified(adjective, significant, essential, basic, vital)
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unavoidable(adjective, significant, essential, basic, vital)
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urgent(adjective, significant, essential, basic, vital)
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wanted(adjective, significant, essential, basic, vital)
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basic(adjective, significant, essential, vital, fundamental)
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bounden(adjective, necessary, obligatory, conclusive)
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cardinal(adjective, significant, essential, basic, vital)
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conclusive(adjective, necessary, obligatory)
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counted upon(expression, adjective, necessary, obligatory)
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crucial(adjective, significant, essential, basic, vital)
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elementary(adjective, significant, essential, basic, vital)
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essential(adjective, significant, basic, vital, necessary)
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indispensable(adjective, significant, essential, basic, vital)
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indissoluble(adjective, necessary, obligatory, conclusive)
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irrevocable(adjective, necessary, obligatory, conclusive)
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necessitous(essential, needed)
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paramount(adjective, significant, essential, basic, vital)
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APASmart Define. (2015). incumbent on thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/incumbent_on/thesaurus/synonyms
ChicagoSmart Define. 2015. "incumbent on thesaurus" https://smartdefine.org/incumbent_on/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, incumbent on thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/incumbent_on/thesaurus/synonyms>.
MLASmart Define. "incumbent on thesaurus" 8 May 2015. Web. 29 September 2026. <https://smartdefine.org/incumbent_on/thesaurus/synonyms>