What is the comparative form of word dryly?

The word "dryly" is already in the adverb form, so it doesn't have a comparative form.

To express a greater degree of dryness, you can use adverbs like:

* More dryly

* Very dryly

* Extremely dryly

* Particularly dryly

* Drier (though this is more of a comparison between two things, like "He spoke drier than she did.")

For example, you could say:

* "He spoke dryly." (Simple statement)

* "He spoke more dryly than usual." (Indicates a higher degree of dryness)

* "He spoke very dryly, almost sarcastically." (Indicates a strong degree of dryness)