In a bold, shameless, or undisguised manner; without attempting to hide wrongdoing or dishonesty.
From 'barefaced' (showing one's face openly, hence without disguise) with the suffix '-ly' creating an adverb indicating manner.
The phrase comes from the idea that if someone isn't wearing a mask or disguise, they're showing their face 'bare'—and if they do something wrong while visible, they're being daringly brazen!
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