Nonexteriority is a term that refers to the state of not being external or outside of something. Some synonyms for nonexteriority include internality, interiority, internalization, and inwardness. These terms imply a focus on the idea of being within oneself or something else, rather than on the surface or outside appearance. Additionally, some related words that could be used in place of nonexteriority include interior, inner, inward, and intrinsic. These synonyms all emphasize the idea of something existing within or being an essential part of something else, rather than existing on the outside.