丧尽天良

喪盡天良
sàngjìntiānliáng
devoid of conscience (idiom); utterly heartless

CEDICT

to be utterly devoid of conscience; to be extremely vicious and evil

Wiktionary

形容泯灭人性极为恶毒

重編國語辭典

丧失所有良知

維基詞典

Entry Composition