Most serriform means having the shape or appearance of a sawtooth. In contrast, the antonyms for the word most serriform include smooth, rounded, blunt, and straight. Smooth implies a surface that is free of roughness, irregularities, or indentations. Rounded refers to something with an even curvature or a circular shape, while blunt denotes a rounded or flattened point. Straight, on the other hand, is used to describe something that is in a linear and direct form, without any curves or bends. So, if you want to describe something that is not most serriform, you can use any of these antonyms to create a different visual image.