9
effectual(adjective, powerful, useful, effective, beneficial)
9
fateful(adjective, importance, significant, valuable, main)
9
first-class(adjective, characteristic, informal, importance, outstanding)
9
high(adjective, subject, accountable, guilty, culpable)
9
noble(adjective, prominent, loud, eminent, influential)
9
preeminent(adjective, great, outstanding, eminent, bad)
9
renowned(adjective, great, big, famous, outstanding)
9
responsible(adjective, charge, importance, valuable, duty)
8
eventful(adjective, bad, great, excellent, extraordinary)
8
exigent(adjective, serious, essential, vital, feature)
8
famed(adjective, famous, outstanding, significant, critical)
8
high-level(adjective, characteristic, eminent, power, influence)
8
high-ranking(adjective, characteristic, eminent, power, influence)
8
large(adjective, famous, significant, familiar, substantial)
8
marked(adjective, extraordinary, significant, substantial, prominent)
8
of note(expression, adjective, characteristic, idiom, feature)
8
organic(adjective, significant, original, basic, vital)
8
prestigious(adjective, characteristic, power, influence, famous)
8
solemn(adjective, importance, valuable, main, notable)
8
top-notch(adjective, characteristic, informal, importance, outstanding)
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APASmart Define. (2016). important thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/important/thesaurus/synonyms
ChicagoSmart Define. 2016. "important thesaurus" https://smartdefine.org/important/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, important thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/important/thesaurus/synonyms>.
MLASmart Define. "important thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/important/thesaurus/synonyms>