an adjective can be used to describe the characteristics of certain nouns, adding more information about the qualities of the noun.
Delicious is used to describe something that is pleasing to the taste, has a great flavor, and is generally enjoyed. The rules associated with the usage of delicious as an adjective include the addition of 'very' when using it as an intensifier. Use cases for the word include food, drinks, and any edible items as well as experiences such as a movie, a book, or a show.
1. His cooking was so delicious I asked for seconds.
2. The sunbathing was delicious after we had cooled down in the swimming pool.
3. She had a delicious cup of tea to soothe her nerves.
Delicious should only be used to describe something that elicits great pleasure and enjoyment and should not be used to describe other non-edible things, such as a book.