turpitude (n.)youdaoicibaDictYouDict[turpitude 词源字典]
"depravity, infamy," late 15c., from Middle French turpitude (early 15c.), from Latin turpitudinem (nominative turpitudo) "baseness," from turpis "vile, physically ugly, base, unsightly," figuratively "morally ugly, scandalous, shameful," of unknown origin. Klein suggests perhaps originally "what one turns away from" (compare Latin trepit "he turns").[turpitude etymology, turpitude origin, 英语词源]