The word "un-healthiest" refers to something that is detrimental to one's physical or mental well-being. To create antonyms for this term, we need to consider words that describe actions or conditions that promote health and well-being. Some suitable antonyms for "un-healthiest" may include words like "nourishing," "healthy," "wholesome," "beneficial," "nutritious," "restorative," "salubrious," and "invigorating." These words imply an environment or lifestyle that is conducive to good health and vitality. By incorporating more of these antonyms into our daily habits, we can improve our overall health and well-being and avoid the negative effects of unhealthy choices.