unstrung (adj.)youdaoicibaDictYouDict[unstrung 词源字典]
1590s, "with strings relaxed" (of a harp, etc.), from un- (1) "not" + past participle of string (v.). Transferred sense of "weakened, unnerved" is recorded from 1690s.[unstrung etymology, unstrung origin, 英语词源]