What kind of adverb is used to modify an adjective?

The kind of adverb that modifies an adjective is called an adverb of degree.

Here's why:

* Adverbs of degree tell us how much or to what extent something is.

* Adjectives describe nouns or pronouns.

Examples:

* Very cold (very modifies the adjective "cold")

* Extremely happy (extremely modifies the adjective "happy")

* Quite large (quite modifies the adjective "large")

* Incredibly beautiful (incredibly modifies the adjective "beautiful")

In summary: Adverbs of degree are used to provide more information about the intensity or degree of an adjective.