Degree adverb

From Teflpedia

A degree adverb or adverb of degree is an adverb that expresses degree.

These can be split into intensifiers, such as "very" and mitigators such as "fairly".

They can be used to modify gradable modifiers, i.e. gradable adjectives and gradable adverbs. I don't think they can be used as sentence adverbs, though.