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 ? 此種自私自利完全蔑視國家利益之理由，北平各團(tuán)體竟敢說出，吾人殊服其～。(魯迅《偽自由書·戰(zhàn)略關(guān)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.
厚顏無恥
shameless;impudent;brazen ～的人person without the slightest sense of shame
厚顏無恥hòu yán wǔ chǐ
顏：面貌。厚臉皮，不知羞恥。bald-faced, audacious, audacity, shameless, far gone in impudence, have the effrontery to, no more of your cheek, be dead to shame