INDISTINCT SHAPE can be described as a 'BLOB, ' which is a four-letter word. A BLOB is an amorphous, shapeless mass that has no distinct form or structure. It is often used to describe something that is not easily defined or categorized. Blobs are often used in art and design to create abstract shapes and forms. In science, blobs are used to describe the shape of certain objects, such as clouds, smoke, and other substances.