Gradable adverb
From Teflpedia
A gradable adverb is an adverb that possesses gradability. Gradable adverbs are gradable modifiers, and are similar to gradable adjectives.
For example, in English, the adverb "quickly" is gradable - "he runs quickly" can be graded to "he runs very quickly" or "he runs fairly quickly", etc.
A gradable adverb can be contrasted with strong adverbs; absolute adverbs appear to be rare.
They usually have gradable antonyms.
Do not confuse gradable adverb with adverb of degree - the latter expresses degree and modifies a phrase.