81 entries under original topic. ×

6
significant(adjective, important, essential, critical)
5
elementary(adjective, important, head, significant, beginning)
5
rudimentary(adjective, important, head, significant, beginning)
4
basal(adjective, lead, important, head, significant)
4
ruling(adjective, important, significant, serious)
3
aboriginal(adjective, head, beginning, opening)
3
critical(adjective, important, essential, basic)
3
elemental(adjective, important, significant, essential)
3
primordial(adjective, important, head, significant, beginning)
3
requisite(adjective, important, significant, essential)
3
sovereign(outstanding, best, prominent, prime)
2
bottom-line(adjective, important, significant, essential)
2
constitutional(adjective, important, significant, basic)
2
headmost(adjective, top, head, beginning)
2
integral(important, significant, essential, critical)
2
intrinsic(adjective, important, significant, essential)
2
primeval(adjective, head, beginning, opening)
2
primitive(adjective, important, head, significant, beginning)
1
ahead(adjective, head, beginning, opening)
1
antecedent(adjective, head, beginning, opening)
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APASmart Define. (2015). cardinal thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/cardinal/thesaurus/synonyms
ChicagoSmart Define. 2015. "cardinal thesaurus" https://smartdefine.org/cardinal/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, cardinal thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/cardinal/thesaurus/synonyms>.
MLASmart Define. "cardinal thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/cardinal/thesaurus/synonyms>