Shameless

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Old English sc(e)amlēas (see shame, -less).

wiktionary

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From Middle English shameles, shamelees, schameles, schomeles, schomeleas, from Old English sċamlēas, sċeamlēas(“without shame; shameless”), from Proto-Germanic *skamalausaz(“shameless”), equivalent to shame +‎ -less. Cognate with West Frisian skamteleas(“shameless”), Dutch schaamteloos(“shameless”), German schamlos(“shameless”), Danish skamløs(“shameless”), Swedish skamlös(“shameless”), Icelandic skammlaus(“shameless; unashamed”).

etymonline

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shameless (adj.)

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.