The antonyms for "more nourished" are "undernourished," "malnourished," and "deprived." When a person is undernourished, it means that they are not getting enough nutrients and vitamins from their food. It can lead to a weak immune system, slow growth, and other health problems. Malnourishment occurs when the body doesn't get enough food, or the right kind of food, to function properly. It can cause stunted growth, weakened muscles, and other serious health issues. Lastly, when someone is deprived of nourishment, they are lacking the vital nutrients and minerals required for good health. This can lead to fatigue, weakness, and poor overall health.