What is the comparative and superlative form of kindly?

"Kindly" is an adverb, and adverbs don't typically have comparative and superlative forms.

To express different degrees of kindness, you would use other adverbs or phrases:

* More kindly (comparative)

* Most kindly (superlative)

* Very kindly

* Extremely kindly

* With great kindness

For example:

* She spoke to him more kindly than she had to her sister.

* He treated his guests most kindly.

* They responded very kindly to my request.