Embarrassed because you know that you have done something wrong or silly. (Cambridge Dictionary)
Resembling a sheep: such as meek, timid. (Merriam – Webster)
Affected by or showing embarrassment caused by consciousness of a fault. (Merriam – Webster)
In an embarrassed manner due to shame or a lack of self-confidence. (Oxford Dictionaries)
If you look sheepish, you look slightly embarrassed because you feel foolish or you have done something silly. (Collins Dictionary)
Bashfully and Sheepishly.
Definition of sheepishly.