The phrase "rock bound" typically refers to a location that is surrounded by rocks or cliffs. Antonyms for this term include open, expansive, and unconfined. These words suggest a location that is free from obstructions, boundaries, or limitations. Other antonyms for rock-bound include flat, featureless, and monotonous, indicating a location that lacks the solid, rugged character associated with rock formations. Additionally, words such as smooth, idle, and helpless can convey a sense of vulnerability or lack of strength, in contrast to the solidity and durability of rock-bound terrain. Overall, antonyms for "rock bound" provide a useful contrast to this term, highlighting different aspects of location and landscape.