The term "flattened" refers to something that has been made level or compressed to become thinner or smoother. There are several synonyms for this word, including squished, compressed, pressed, mashed, smushed, and crushed. These words can be used to describe the action of reducing the thickness or height of an object or surface. For example, when a piece of paper is flattened, it becomes smoother and more even. Similarly, when a person's hair is flattened, it can be described as being pressed down or smoothed out. Overall, these synonyms for "flattened" are useful for describing different ways of reducing the height or thickness of an object.