Gradable adjectives are adjectives that have degrees or levels of intensity, size, etc. and can have comparative and superlative forms. They can also be strengthened or diminished by using adverbs such as very, rather, more, less, fairly, and so on.
- Soanes, C. "A very, extremely, highly, really, most *unique* opportunity!!" Oxford Dictionaries. Retrieved 10th October 2012.