barefaced lie/liar

A blatantly obvious and/or impudent untruth, one in which the liar does not attempt to disguise their mendacity. Sir, I have never done these things of which you accuse me; they are bold-faced lies, and nothing more.

A shamelessly bold untruth/prevaricator. Bare here means bold-faced or brazen, but one writer speculates that barefaced, which dates from the late sixteenth century, originally meant “beardless,” a condition perhaps considered audacious in all but the youngest men. In any event, by the late seventeenth century it also meant bold and became attached to lie in succeeding years. See also naked truth.