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

192 entries under significant topic. ×

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esteemed(vital, imperative)
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expressive(adjective, weighty, loaded, telling)
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firm(large, key, considerable, conclusive)
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generous(large, considerable)
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hefty(big, heavy, substantial, large)
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huge(substantial, large)
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imaginative(weighty, loaded)
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important serious(expression, adjective, important, historic)
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inventive(weighty, loaded)
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large-scale(substantial, large)
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lavish(intense, powerful, substantial, large)
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loaded
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mandatory(adjective, essential, basic, vital)
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obligatory(adjective, essential, basic, vital)
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original(weighty, loaded)
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reasonable(substantial, large)
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redolent(weighty, loaded)
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requisite(adjective, essential, basic, vital)
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respectable(substantial, large)
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rich(weighty, loaded)
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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>