be dead to (all feelings of) shame; be devoid of all sense of shame; be impervious (/lost) to shame; be past (/beyond)shame; Fie’for shame;be quite without shame; be shameless; blush like the black (/blue) dog; have no sense of shame;have the face (/cheek/effrontery/nerve/impudence) to; brazen;impu dent; not feel ashamed at all; unabashed;una shamed; unblushing/“打這個～的走狗！” (楊沫《青春之歌》604)“Beat him up!”“Dirty dog!”“How low can you sink!”
恬不知恥
not feel ashamed;have no sense of shame;be shameless
恬不知恥tián bù zhī chǐ
恬：安然。做了壞事卻毫不在乎，不知道羞恥。be shameless, have the face to, be quite without shame