The word slimnesses refers to the quality or state of being slim or thin. Some synonyms for slimnesses include leanness, slenderness, svelteness, and narrowness. These words are often used interchangeably to describe a physically slender or thin person or object. Additionally, other synonyms for slimnesses might include wispy, skinny, trim, or narrow-waisted. These words can be used to describe a range of things, from a person's body shape to the shape of an object like a needle or pencil. Overall, these synonyms for slimnesses provide a variety of ways to describe the state of being slim or thin.