na-adjective, noun
shameless; shameless person
Used as a noun or adjectival noun to describe someone who lacks shame or acts without embarrassment. Often carries a strong negative judgment.
彼は嘘をついても平気な恥知らずだ。
He is a shameless person who doesn't care even when he lies.
あんな恥知らずな行
I can't forgive such shameless behavior.