The term "convexes" refers to objects or shapes that bulge outward in a smooth, curved manner. The opposite of convexes are concaves, which are shapes that dip inward or form a hollow. For example, a sphere is a convex shape, while a bowl is a concave shape. Other antonyms for convex may include flat, straight, or angular, depending on context. In geometry, the term "concave" is often used to describe a shape that is the opposite of convex. Antonyms are essential for creating clear and precise language, helping us convey our thoughts and ideas effectively.