flexibility (n.)youdaoicibaDictYouDict[flexibility 词源字典]
1610s, of physical things, from French flexibilité (in Old French, "weakness, vacillation") or directly from Late Latin flexibilitatem (nominative flexibilitas), from Latin flexibilis "pliant, yielding" (see flexible). Of immaterial things from 1783.[flexibility etymology, flexibility origin, 英语词源]