flimsy (adj.)youdaoicibaDictYouDict[flimsy 词源字典]
1702, of unknown origin, perhaps a metathesis of film (n.) "gauzy covering" + -y (2). Figuratively (of arguments, etc.) from 1750s. Related: Flimsily; flimsiness.[flimsy etymology, flimsy origin, 英语词源]