lacking scruples; shameless
Well! Of all the artful and designing orphans that ever I see, Oliver, you are one of the most bare-facedest — Dickens
barefacedly /beəʹfaystli, -sidli/ adv
barefacedness noun
[originally ‘having no beard’ or ‘with the face uncovered’, then ‘undisguised’ or ‘blatant’ in unfavourable contexts of villainy or tyranny]