IPA: /ˈʃiːpɪʃli/
KK: /ˈʃipɪʃli/
In a way that shows you are embarrassed or shy, often because you have done something wrong or foolish.
He smiled sheepishly after realizing he had forgotten her birthday.
Sheepishly → It is formed from "sheep" (from Old English *sceap*, meaning a domesticated animal known for its wool) and the suffix "-ishly" (meaning in a manner of). The word describes behaving in a manner that is timid or embarrassed, akin to the shy nature often attributed to sheep.
Think of a sheep, which is often seen as timid or shy, and remember that to act 'sheepishly' means to behave in a shy or embarrassed way.