audacious; cheeky impudent; brazen;shameless; bald-faced; brazen-faced; be dead (/lost) to shame; be past shame;have no sense of shame; have the effrontery (/impudence/audacity/hide) to do sth ❍ 此种自私自利完全蔑视国家利益之理由，北平各团体竟敢说出，吾人殊服其～。(鲁迅《伪自由书·战略关系》24引文)Such selfish reasons which entirely scorn the interests of the state could have been given by the various organizations in Beiping. We really admire their audaciousness.
厚颜无耻
shameless;impudent;brazen ～的人person without the slightest sense of shame
厚颜无耻hòu yán wǔ chǐ
颜：面貌。厚脸皮，不知羞耻。bald-faced, audacious, audacity, shameless, far gone in impudence, have the effrontery to, no more of your cheek, be dead to shame