flashy (adj.)youdaoicibaDictYouDict[flashy 词源字典]
"showy, cheaply attractive," 1680s, from flash (n.1) + -y (2). Earlier it meant "splashing" (1580s); "sparkling, giving off flashes" (c. 1600), but those senses have become rare. Related: Flashily; flashiness.[flashy etymology, flashy origin, 英语词源]