feeling or looking ashamed because you have done something bad or stupid 面带愧色的；羞惭的；惭愧的 a shamefaced smile 惭愧的笑容 She looked shamefaced. 她看上去面带愧色。
Word Originmid 16th cent. (in the sense ‘modest, shy’): alteration of archaic shamefast, by association with face.