You have to take the entire phrase “forever chemicals” together. It’s a subset of chemicals that don’t break down / take a long time to break down and can’t be

You have to take the entire phrase “forever chemicals” together. It’s a subset of chemicals that don’t break down / take a long time to break down and can’t be processed by the human body. At that point, it becomes a well defined phrase no matter what your opinion on the word chemical by itself means or implies.