Unhealthy is a term that is often used to describe something that is harmful or bad for one's physical or mental wellbeing. However, there are several antonyms that can be used to describe the opposite of unhealthy. Some of the common antonyms for unhealthy include healthy, wholesome, sound, nourishing, immune-boosting, energizing, and rejuvenating. Eating a balanced diet, exercising regularly, getting enough sleep, and avoiding harmful substances like tobacco and alcohol are some of the ways to promote a healthy lifestyle. By incorporating these habits into your daily routine, you can ensure that you are living a balanced and healthy life.