Incurvate is a term that signifies something that is bowed or rounded. To create the antonyms for more incurvate, one would have to use words that describe the opposite of curved. Words like straight, flat, and level are perfect antonyms, as they indicate the opposite of something that is bent or curved. Additionally, other antonyms include planar, uncurved, uncurled, and unrounded. These words work well to describe a flat or even surface, which is the opposite of a surface that is curved or bent. Overall, antonyms for more incurvate can be found in words that describe the opposite of rounded or bent surfaces.