A barren hill is a term used to describe a hill that is devoid of plants and trees. Synonyms for barren hill include desolate hill, treeless hill, bald hill, and rocky hill. A desolate hill refers to a hill that is abandoned and forsaken. A treeless hill is self-explanatory, meaning a hill without any trees on it. A bald hill refers to a hill that has no vegetation growing on it, just like a bald man with no hair. A rocky hill implies a hill that is covered in rocks or boulders and often has a rugged terrain. All these synonyms convey the idea of an arid and lifeless hill.