IPA: //nɒnˈnjuːtrɪəs//
KK: /nɑːnˈnjuːtrɪʃəs/
Not providing the nutrients that are necessary for health and growth.
Many fast foods are considered nonnutritious because they lack essential vitamins and minerals.
Nonnutritious → It is formed from "non-" (meaning not) and "nutritious" (from Latin "nutritius", meaning nourishing). The word "nonnutritious" means not nourishing or lacking in nutritional value.
Think of 'not' ('non-') providing 'nourishment' ('nutritious') — that's why nonnutritious means lacking in nourishment.