a person who has lost all sense of shame; a shameless person ? 只有～才說這種無恥的話，干這種無恥的勾當。Only a shameless person makes such shameless remarks and takes part in such shameless activities.
無恥之徒wú chǐ zhī tú
指不知羞恥的家伙。a shameless person, a person who has lost all sense of shame, cool beggar