The word healthfully is often used to describe the act of taking care of one's health in a proper manner. In terms of synonyms, some common words that can be used instead of healthfully include nutritiously, wholesomely, and nourishingly. Other options include fitness, wellness, and longevity. When referring to a specific aspect of health, such as mental health, synonyms for healthfully can include mentally stable or emotionally sound. It's important to note that although these words convey a similar meaning, they may have different connotations or emphasize different aspects of health. Choosing the appropriate synonym will depend on the context and desired tone of the text.