undead (adj.)youdaoicibaDictYouDict[undead 词源字典]
"neither dead nor alive," c. 1400, from un- (1) "not" + dead. As a noun meaning "vampires and such," from 1904. Old English undeadlic (adv.) meant "immortal, for all eternity." [undead etymology, undead origin, 英语词源]