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

192 entries under significant topic. ×

1
greatest(adjective, bad, great, solid, extraordinary)
1
grievous(adjective, tough, severe, heavy, important)
1
hazardous(adjective, heavy, serious, vital)
1
heavy number(expression, adjective, important, historic)
1
importunate(big, substantial, valuable, vital)
1
incumbent on(expression, adjective, essential, basic)
1
indispensable(adjective, important, substantial, serious)
1
massive(intense, big, heavy, powerful)
1
mattering much(expression, big, substantial, valuable)
1
mondo(big, important, substantial, large)
1
name of game(expression, adjective, idiom, essential)
1
needed(adjective, essential, basic, vital)
1
needful(adjective, essential, basic, vital)
1
noticeable(adjective, great, solid, extraordinary, unusual)
1
of note(expression, idiom, importance, big)
1
of substance(expression, big, substantial, valuable)
1
peculiar(adjective, solid, extraordinary, superior, unusual)
1
perilous(adjective, heavy, serious, vital)
1
plentiful(substantial, large, considerable)
1
pointed(adjective, energetic, vigorous, definite)
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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>