What is the comparative form of shyly?

There isn't a comparative form of "shyly" because it's already an adverb. Adverbs describe verbs, adjectives, or other adverbs, and they don't usually have comparative forms like adjectives do.

To express a greater degree of shyness, you would use adverbs like:

* More shyly

* Very shyly

* Extremely shyly

* Remarkably shyly

You could also use phrases like "with more shyness" or "in a more shy manner."