bald-faced lie
A blatantly obvious and/or impudent untruth, one in which the liar does not attempt to disguise his or her mendacity. Our son tells us nothing but bald-faced lies when we ask him where he goes at night.
bald-faced liar
One who tells blatantly obvious and/or impudent untruths easily and with little or no attempt to disguise the lie. Everyone knows he is just a bald-faced liar. It's a wonder anyone believes a thing he says anymore.