unapologetic

US /ˌʌn.ə.pɑː.ləˈdʒet̬.ɪk/
UK /ˌʌn.ə.pɑː.ləˈdʒet̬.ɪk/
1.

ไม่รู้สึกผิด

not sorry about having caused someone problems or unhappiness, even though people might expect you to be sorry:

:
They were very rude and completely unapologetic about it.