Complanate is a term used to describe a flat and level surface or object. Its antonyms would be words that describe uneven, bumpy, or rugged surfaces. Some suitable antonyms for complanate include rough, uneven, serrated, pitted, jagged, lumpy, and bulging. If something is not complanate, it might be irregular, unsmooth, or craggy. These words are appropriate when describing natural terrain or rock formations, but they can also be used to describe man-made structures such as roads or buildings that are not level or flat. Therefore, depending on the context, the antonyms for complanate reveal the variety of textures and shapes found in our surrounding environment.