There are many antonyms for the term "progressive autonomic failures". Instead of a condition that gets progressively worse, there are many medical conditions that get progressively better. These might include conditions like improving blood pressure, returning to a normal heart rate, or regaining control over the autonomic nervous system. Additionally, there are many conditions that are not progressive at all. For example, a person might experience a one-time event that affects their autonomic nervous system, but then return to normal. Finally, in some cases, the autonomic nervous system may be overactive rather than underactive, leading to symptoms like anxiety, sweating, or palpitations. Overall, there are many possibilities for antonyms to the term "progressive autonomic failures", depending on the specific context.