shameless (adj.)youdaoicibaDictYouDict[shameless 词源字典]
Old English scamleas "shameless, impudent, immodest;" see shame (n.) + -less. Related: Shamelessly; shamelessness. Similar formation in Old Norse skammlauss, Dutch schaamteloos, Old High German scamalos, German schamlos.[shameless etymology, shameless origin, 英语词源]