61 entries under importance topic. ×

15
outstanding(adjective, excellent, extraordinary, superior)
15
solemn(adjective, valuable, main, notable)
14
historic(adjective, important, main, extremely significant)
14
unforgettable
12
grand(adjective, valuable, main, notable)
12
meaningful(adjective, good, clear, strong, great)
11
eventful(adjective, bad, great, excellent, extraordinary)
11
responsible(adjective, valuable, duty, reliable)
11
signal(adjective, great, solid, extraordinary)
10
big-league(adjective, valuable, main, notable)
10
earnest(adjective, important, valuable, main)
10
key(adjective, valuable, main, notable)
9
bigwig(adjective, valuable, main, notable)
9
prominent(adjective, good, strong, solid, extraordinary)
8
exciting(adjective, valuable, main, notable)
8
newsworthy(adjective, important, valuable, main)
8
purposeful(adjective, valuable, main, notable)
7
big shot(adjective, valuable, main, notable)
7
big time(adjective, main, extremely significant)
7
challenging(adjective, valuable, main, notable)
10 years ago|15k views|share |citing 
APASmart Define. (2016). momentous thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/momentous/thesaurus/synonyms
ChicagoSmart Define. 2016. "momentous thesaurus" https://smartdefine.org/momentous/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, momentous thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/momentous/thesaurus/synonyms>.
MLASmart Define. "momentous thesaurus" 1 April 2016. Web. 1 October 2026. <https://smartdefine.org/momentous/thesaurus/synonyms>