changeable (adj.)youdaoicibaDictYouDict[changeable 词源字典]
mid-13c., "unstable, inconstant, unreliable," from Old French changeable "inconstant," from changier (see change (v.)) + -able (see -able). Meaning "subject to variation" is from late 14c. Related: Changeably.[changeable etymology, changeable origin, 英语词源]