Most complanate means flattened or leveled. The antonyms for this word would be words used to describe things that are not flat or leveled. These could include words such as bumpy, uneven, rough or rugged. When something is bumpy, it means there are small or large irregularities, bumps or curves on the surface. Uneven refers to surfaces that have variations in height or level, creating an uneven or jagged surface. Rough indicates surfaces that are uneven, coarse or not smooth, while rugged is used to describe surfaces that are rocky or uneven, often with harsh and uneven terrain. When looking for antonyms of most complanate, it's useful to consider words that describe a surface that is not flat or even.