Encephalon disease, also known as brain disease, is a condition that affects the brain and nervous system. There are several antonyms for encephalon disease, including wellness, health, and vitality. These words describe the absence of disease or illness and indicate a state of optimal physical and mental functioning. Other antonyms for encephalon disease include strength, vigor, and energy, which imply a state of robust health and vitality. The opposite of encephalon disease is a healthy brain and nervous system, which function optimally and allow individuals to think clearly, make decisions, and live their lives to the fullest.