If someone is undernourished, they are weak and unhealthy because they have not been eating enough food or the right kind of food.
例句
People who are undernourished also lack reserves of energy when faced with physical or mental crises.营养不良的人在体力或脑力上出现紧急情况时还缺乏足够的能量储备。...undernourished children.营养不良的孩子们
英汉词典释义
adj.
营养不良的
One morning we came upon an abandoned undernourished puppy on the porch.一天早上在走廊上我发现了一只营养不良、被人抛弃的小狗。