"Dead feet" are often used to describe a feeling of numbness or tingling in the feet, which can be uncomfortable and can cause difficulty in walking or standing. Some antonyms for "dead feet" would be lively, active, or energetic feet. When our feet are active and energetic, we are able to move around freely and engage in physical activities without feeling any discomfort or pain. Lively feet are also associated with good health, as being physically active helps improve circulation and overall well-being. Therefore, it's essential to keep our feet moving and ensure they are healthy to avoid experiencing the unpleasant sensation of "dead feet.