Nouns that are antonyms for the word "guttiness" include "emptiness," "hollowness," and "thinness." Emptiness refers to a lack of substance or significance, making it the polar opposite of the term "guttiness," which implies fullness and substance. Hollowness, on the other hand, can describe something that appears full but has little depth or substance inside, which provides a contrasting meaning to "guttiness." Lastly, thinness suggests that something is lacking in volume or density, which is diametrically opposed to the idea of something being gutty. Therefore, these word options offer different ways to describe the opposite of "guttiness.