43 entries under original topic. ×

20
important(adjective, significant, essential, critical)
19
primary(adjective, lead, important, head, significant)
18
cardinal(noun, adjective, lead, important, head)
16
fundamental(adjective, important, significant, essential)
16
essential(adjective, important, significant, basic)
15
prime(adjective, lead, important, head, significant)
14
principal(adjective, lead, important, head, significant)
10
crucial(adjective, important, significant, essential)
10
paramount(adjective, important, significant, essential)
9
basic(adjective, important, significant, essential)
9
vital(adjective, important, significant, essential)
7
major(adjective, lead, important, head, significant)
7
significant(adjective, important, basic, vital)
4
deep-seated(adjective, individual, essential, private)
4
elemental(adjective, important, significant, essential)
4
elementary(adjective, top, important, significant)
4
first(adjective, top, important, significant)
4
indispensable(adjective, important, significant, serious)
4
integral(adjective, important, significant, essential)
4
primordial(adjective, important, significant, basic)
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APASmart Define. (2015). central thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/central/thesaurus/synonyms
ChicagoSmart Define. 2015. "central thesaurus" https://smartdefine.org/central/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, central thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/central/thesaurus/synonyms>.
MLASmart Define. "central thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/central/thesaurus/synonyms>