50 entries under imperative topic. ×

20
important(adjective, significant, original, essential, critical)
19
primary(adjective, lead, important, head, significant)
18
cardinal(noun, adjective, lead, important, head)
16
fundamental(adjective, important, significant, original, essential)
16
essential(adjective, important, significant, original, basic)
16
chief(adjective, lead, important, head, significant)
15
main(adjective, lead, important, head, significant)
14
principal(adjective, lead, important, head, significant)
11
foremost(adjective, lead, head, significant, master)
10
paramount(adjective, important, significant, original, essential)
9
basic(adjective, important, significant, original, essential)
9
vital(adjective, important, significant, original, essential)
4
signal(important, significant, vital)
3
salient(adjective, significant, vital, main, middle)
2
great(significant, vital)
2
heavy(important, significant, vital, fundamental)
2
material(significant, essential, basic, vital)
2
serious(important, significant, basic, prime, vital)
2
substantial(important, significant, vital)
2
weighty(important, significant, vital)
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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>