Synonyms|659Antonyms|114|Broader|10Narrower|15Related|819

192 entries under significant topic. ×

1
cardinal(adjective, important, substantial, serious)
1
central(critical, vital, decisive, imperative)
1
certain(adjective, superior, energetic, unusual, exceptional)
1
chips are down(expression, adjective, idiom, important)
1
de rigueur(expression, adjective, essential, basic)
1
deep(adjective, tough, severe, intense, important)
1
definite(adjective, superior, energetic, unusual, exceptional)
1
determining(big, substantial, valuable, vital)
1
doozie(big, important, outstanding, substantial)
1
dynamite(big, important, substantial, large)
1
eloquent(adjective, intense, important, powerful)
1
excellent(adjective, bad, great, superior, important)
1
exigent(adjective, big, heavy, substantial)
1
expedient(adjective, essential, basic, vital)
1
extensive(big, substantial, large, valuable)
1
fab(big, important, substantial, large)
1
fat(big, heavy, important, substantial)
1
foremost(adjective, important, essential, vital)
1
front-page(big, important, substantial, valuable)
1
goodly(substantial, large, considerable)
For more, visit Momentous on Power Thesaurus
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>