Done or said without shame or concealment; blatantly dishonest or impudent.
From 'bare' (uncovered, exposed) + 'faced' (having a face). Originally in the 16th century, it literally meant to show one's face boldly without a mask, then evolved to mean shamelessly obvious lies.
Before makeup as we know it, a 'barefaced' lie literally meant lying with your actual uncovered face—no mask to hide behind—which is why it became synonymous with shameless, obvious dishonesty.
Complete word intelligence in one call. Free tier — 50 lookups/day.