Crinkledness refers to the state or quality of being crinkled, wrinkled, or creased. The antonyms for this word are smoothness and flatness. Smoothness denotes a surface that is even, regular, and free from bumps or wrinkles. Flatness is the quality of being level, uniform, and without folds or creases. These antonyms can be used to describe a variety of objects and materials, such as textiles, paper, and metal. For instance, a smooth sheet of paper is free from crinkledness, while a flat sheet of metal has no creases or wrinkles. When seeking the opposite of crinkledness, one can use these antonyms to convey an idea of smooth, even, and uniform surfaces.