Unhealthier means not conducive to good health or injurious to health. Its antonyms could include words like healthier, wholesome, beneficial, nourishing, and salutary. Healthier refers to something that promotes good health and well-being, while wholesome refers to something that is good for your physical and mental well-being. Beneficial denotes something that has a positive impact on your health, and nourishing means promoting the growth and development of the body. Salutary means something that is not only beneficial but also has a curative effect. Using these antonyms in place of unhealthier can help promote positive health outcomes and lead to a healthier lifestyle.