Answer:
Adjective
Step-by-step explanation:
The word “fly” can be used as a verb (when it indicates an action), as a noun (when it refers to a class of thing) or an adjective (when it modifies or describes a noun). In the sentence, “fly” is being used as an adjective that means “stylish and fashionable” and that modifies, describes or gives further detail of the noun “ball”.