What is an adjective for roast?

Answer 1

The word 'roasted' is a verbal adjective; the past participle of the verb to roast. Example sentence:

The roasted duck was delicious.

Another verbal adjective is the present participle of the verb to roast, roasting. Example sentence:

This recipe calls for a roasting chicken.

Answer 2

The adjective form of the verb roast is "roasted." Roast as a noun is also used as an adjunct with a similar meaning.