IPA: /ˈbɛəˌfeɪstnəs/
KK: /ˈbɛrˌfeɪstnəs/
The quality of being shameless or bold, especially in showing a lack of honesty or decency.
His barefacedness in lying to his friends shocked everyone.
Barefacedness is formed from "bare" (from Old English *bær*, meaning uncovered or exposed), "faced" (from the root "face", which comes from Latin *facies*, meaning appearance or surface), and "-ness" (a suffix meaning the state or quality of). The word refers to the quality of being shameless or brazen, literally suggesting an exposed or uncovered face in terms of boldness.
Think of someone with an 'uncovered' ('bare') face showing 'appearance' ('facies') without shame — that's what barefacedness means.