48
important(adjective, good, bad, strong, great)
41
consequential(adjective, good, clear, importance, big)
39
significant(adjective, good, clear, strong, great)
35
weighty(adjective, good, clear, strong, tough)
31
remarkable(adjective, extraordinary, importance, important, lively)
30
serious(adjective, good, great, severe, extraordinary)
28
grave(adjective, importance, important, valuable, main)
25
crucial(adjective, great, tough, severe, extraordinary)
24
vital(adjective, severe, importance, big, heavy)
22
notable(adjective, solid, extraordinary, importance, unusual)
22
pivotal(adjective, feature, state, characteristic, important)
21
essential(adjective, feature, state, characteristic, importance)
20
memorable(adjective, great, extraordinary, superior, importance)
20
substantial(adjective, strong, importance, big, heavy)
19
critical(adjective, great, severe, extraordinary, big)
19
major(adjective, bad, great, tough, severe)
18
fateful(adjective, importance, important, significant, valuable)
18
material(noun, adjective, good, importance, big)
17
big(adjective, good, importance, heavy, important)
17
great(adjective, bad, excellent, importance, important)
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APASmart Define. (2016). momentous thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/momentous/thesaurus/synonyms
ChicagoSmart Define. 2016. "momentous thesaurus" https://smartdefine.org/momentous/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, momentous thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/momentous/thesaurus/synonyms>.
MLASmart Define. "momentous thesaurus" 1 April 2016. Web. 22 September 2026. <https://smartdefine.org/momentous/thesaurus/synonyms>