If you are shamefaced, you feel embarrassed because you have done something that you know you should not have done. There was a long silence, and my father looked shamefaced. if someone is shamefaced, they look and feel ashamed because they have done something wrong or they have behaved badly
showing a sense of shame extremely modest or shy; "cheerfully bearing reproaches but shamefaced at praise"- H
in a shamefaced manner; "quarrels and dissensions ensued among the cast, most of whom hurriedly and shamefacedly handed over their parts to understudies