The term "bulged out" describes a protrusion of an object. Some antonyms for this term could be "shrunken," "retracted," "contracted," "inward," or "concave." These words depict objects that are not expanding or growing, but instead are either getting smaller or staying the same size. They can also be used to describe objects that appear to curve inward rather than outward. While "bulged out" typically has a negative connotation, these antonyms can be used to describe a more controlled or restrained appearance. These words can be useful when describing objects in both a scientific and everyday context, providing a clear and concise description of their physical characteristics.