Antonyms of adj nutritious

1 sense of nutritious

Sense 1
alimentary, alimental, nourishing, nutrient, nutritious, nutritive -- (of or providing nourishment; "good nourishing stew")

INDIRECT (VIA wholesome) -> unwholesome -- (detrimental to physical or moral well-being; "unwholesome food"; "unwholesome habits like smoking")

Similarity of adj nutritious

1 sense of nutritious

Sense 1
alimentary, alimental, nourishing, nutrient, nutritious, nutritive -- (of or providing nourishment; "good nourishing stew")
       => wholesome (vs. unwholesome) -- (conducive to or characteristic of physical or moral well-being; "wholesome attitude"; "wholesome appearance"; "wholesome food")