Hillocky is an adjective that is used to describe a terrain that is full of small hills or hillocks. If one wants to avoid using the word hillocky, there are several other synonyms that can be used as an alternative. Some of these synonyms include rolling, undulating, hilly, bumpy, knobby, lumpy, and rugged. All these words can be used to describe a piece of land that has small hills or mounds. Depending on the context in which the word is used, these synonyms can adequately substitute the word hillocky to provide clarity and elegance to the written or spoken language.