gradable

Short definition from Wiktionary

Adjective

1. 1
   Able to form degrees or grades
2. 2
   Able to occur in varying degrees; able to be inflected or modified to express degrees of meaning.
3. 3
   steep, but still able to be climbed by a motor vehicle

Noun

1. 1
   A word that can be inflected to specify the degree or grade of something.