When you think about how timid and shy a flock of sheep can be, the adverb sheepishly will make perfect sense. Anyone who acts in a way that betrays their shame and bashfulness is behaving sheepishly.

Is sheepishly an adjective or adverb?

sheepishly adverb - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com.

What type of adverb is sheepishly?

In a sheepish way; meekly; self-consciously; with embarrassment.