9
prominent(adjective, good, strong, solid, extraordinary)
8
exciting(adjective, importance, valuable, main, notable)
8
newsworthy(adjective, importance, important, valuable, main)
8
purposeful(adjective, importance, valuable, main, notable)
7
big shot(adjective, importance, valuable, main, notable)
7
big time(adjective, importance, main, extremely significant)
7
challenging(adjective, importance, valuable, main, notable)
7
constitutive(adjective, importance, valuable, main, notable)
7
donnish(adjective, importance, valuable, main, notable)
7
far reaching(adjective, importance, valuable, main, notable)
7
fraught(adjective, portentous)
7
haughty(adjective, importance, valuable, main, notable)
7
high-up(adjective, importance, valuable, main, notable)
7
key-note(adjective, importance, valuable, main, notable)
7
leading(adjective, feature, state, characteristic, good)
7
principal(adjective, good, bad, great, excellent)
7
relevant(adjective, clear, importance, big, significant)
7
significative(adjective, importance, valuable, main, notable)
7
special(adjective, bad, great, excellent, superior)
7
urgent(adjective, clear, tough, severe, big)
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APASmart Define. (2016). momentous thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/momentous/thesaurus/synonyms
ChicagoSmart Define. 2016. "momentous thesaurus" https://smartdefine.org/momentous/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, momentous thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/momentous/thesaurus/synonyms>.
MLASmart Define. "momentous thesaurus" 1 April 2016. Web. 30 September 2026. <https://smartdefine.org/momentous/thesaurus/synonyms>