barefaced (adj.)youdaoicibaDictYouDict[barefaced 词源字典]
1580s, "with face uncovered or shaven;" see bare (adj.) + face (n.). Thus, "unconcealed" (c. 1600), and, in a bad sense, "shameless" (1670s). Compare effrontery. The half-French bare-vis (adj.) conveyed the same sense in Middle English.[barefaced etymology, barefaced origin, 英语词源]