The word "hackly" refers to something that has rough, jagged edges. However, there are several other words that can be used interchangeably with this term to describe a similar texture or appearance. Some synonyms for "hackly" include spiky, jagged, craggy, rough, rocky, uneven, serrated, knotty, and gnarled. These words can effectively be used to describe things like a rocky terrain, a tree with twisted branches, or a jagged rock formation. Whether you're trying to describe something in a piece of writing or everyday conversation, using these synonyms can help you diversify your vocabulary and add more depth and meaning to your descriptions.