The quality or state of being showy, luxurious, or excessively ornate in a wasteful or pretentious way.
From 'fastuous' combined with the noun-forming suffix '-ness'. This term describes the characteristic quality of excessive, ostentatious display, rooted in Latin 'fastus' meaning arrogant pride.
In a world obsessed with 'flexing' and status symbols, 'fastuousness' is the old-school word for exactly that behavior—but it's been out of fashion for centuries, replaced by terms like 'ostentation.' It's ironic that the word describing showy excess became unfashionable itself.
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