Inherited metabolic brain diseases are a group of genetic disorders that affect the storage, processing, and distribution of essential substances in the body's cells. Some antonyms to describe these diseases might include acquired, non-hereditary, and sporadic. Acquired metabolic brain diseases, for example, are caused by environmental factors, such as exposure to toxins or infectious agents, rather than inherited genetic mutations. Similarly, non-hereditary diseases do not follow a predictable pattern of inheritance, and sporadic diseases occur without any known underlying genetic cause. While antonyms might help to differentiate different types of metabolic brain diseases, understanding the nature of each condition requires more detailed knowledge of its underlying biological processes.