More inclined to show off or display ostentatiously; comparative form of 'flaunt' used as an adjective.
From 'flaunt' + '-y' (adjective suffix) + '-er' (comparative suffix). Creates the comparative degree of 'flaunt' when used adjectivally, meaning more showy or exhibitionist.
The fact that we can stack suffixes like '-y' and '-er' shows how creative English speakers are—'flauntier' isn't always in formal dictionaries but native speakers instantly understand it, which reveals how our brains generate new words on the fly!
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