Hummocky is a term used to describe terrain that is uneven, bumpy, and irregular. There are several other synonyms that can be used to describe this type of landscape, such as lumpy, hilly, knobby, and undulating. The term "knoll" is also often used to describe a small, rounded hill or mound that makes up part of a hummocky landscape. Additionally, some people might use the terms "rolling" or "boiling" to describe a hummocky terrain that is particularly uneven or rough. Whatever word you choose to use, the key is to convey the sense of irregularity and unevenness that characterizes this type of terrain.