to have no sense of shame; a common insult used to describe someone who has no dignity or acts in a disgraceful way

(colloquial) to be utterly shameless; to have no sense of shame; used as a harsh insult or to criticize someone's behavior

(colloquial) To respond with arrogance or disrespect when shown courtesy; to reject a face-saving offer.

to care about one's reputation or dignity; to be sensitive to losing face