323 entries under adjective topic. ×

17
portentous(importance, valuable, main, notable)
16
considerable(importance, big, heavy, important)
16
influential(importance, important, powerful, valuable)
15
impressive(bad, strong, great, excellent)
15
outstanding(excellent, extraordinary, superior, importance)
15
solemn(importance, valuable, main, notable)
14
historic(importance, important, main, extremely significant)
14
unforgettable
13
noteworthy(great, solid, extraordinary, big)
12
grand(importance, valuable, main, notable)
12
meaningful(good, clear, strong, great)
11
eventful(bad, great, excellent, extraordinary)
11
responsible(importance, valuable, duty, reliable)
11
signal(great, solid, extraordinary, importance)
10
big-league(importance, valuable, main, notable)
10
decisive(great, extraordinary, big, important)
10
earnest(importance, important, valuable, main)
10
key(importance, valuable, main, notable)
9
bigwig(importance, valuable, main, notable)
9
chief(bad, great, excellent, superior)
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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>