https://www.merriam-webster.com/thesaurus/sumptuousness
SUMPTUOUSNESS Synonyms: 67 Similar and Opposite Words | Merriam-Webster Thesaurus
Synonyms for SUMPTUOUSNESS: opulence, lavishness, luxuriousness, magnificence, richness, grandeur, luxury, luxuriance; Antonyms of SUMPTUOUSNESS: vulgarity,...
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https://io.wiktionary.org/wiki/sumptuousness
sumptuousness - Wikivortaro