frailty (n.)youdaoicibaDictYouDict[frailty 词源字典]
mid-14c., freylte, from Old French fraileté "frailty, weakness," from Latin fragilitatem (nominative fragilitas) "weakness, frailty," from fragilis "fragile" (see fragility). Related: Frailties.[frailty etymology, frailty origin, 英语词源]