106 entries under basic topic. ×

1
expedient(adjective, good, correct, right, reasonable)
1
first(adjective, important, significant, original, essential)
1
foundational(adjective, important, significant, original, essential)
1
grass-roots(adjective, important, significant, original, essential)
1
heavy(important, essential, critical, fundamental)
1
intrinsic(adjective, important, significant, original, essential)
1
life-or-death(adjective, important, essential, critical)
1
life or death(expression, idiom, need, essential)
1
major(adjective, important, significant, original, essential)
1
meat-and-potatoes(adjective, important, significant, original, essential)
1
name(important, essential, critical, fundamental)
1
name-of-the-game(important, essential, critical, fundamental)
1
nitty-gritty(condition, important, essential, critical)
1
original(adjective, important, significant, essential)
1
primitive(adjective, important, significant, original, essential)
1
primordial(adjective, important, significant, original, essential)
1
quintessential(adjective, significant, essential, vital)
1
radical(adjective, important, significant, original, essential)
1
rudiment(noun, condition, essence, necessity)
1
rudimentary(adjective, important, significant, original, essential)
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APASmart Define. (2015). requisite thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/requisite/thesaurus/synonyms
ChicagoSmart Define. 2015. "requisite thesaurus" https://smartdefine.org/requisite/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, requisite thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/requisite/thesaurus/synonyms>.
MLASmart Define. "requisite thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/requisite/thesaurus/synonyms>