vulnerable (adj.)youdaoicibaDictYouDict[vulnerable 词源字典]
c. 1600, from Late Latin vulnerabilis "wounding," from Latin vulnerare "to wound, hurt, injure, maim," from vulnus (genitive vulneris) "wound," perhaps related to vellere "pluck, to tear" (see svelte), or from PIE *wele-nes-, from *wele- (2) "to strike, wound" (see Valhalla).[vulnerable etymology, vulnerable origin, 英语词源]