General Antonyms:
* Bareness: This implies a lack of foliage, often referring to a tree or landscape.
* Desolation: This refers to a complete lack of vegetation, creating a barren and desolate environment.
* Aridity: This suggests a lack of moisture and therefore, a lack of foliage.
More Specific Antonyms:
* Wood: This could be considered an antonym in situations where "foliage" refers specifically to leaves, as wood refers to the trunk and branches of a tree.
* Rock: This could be considered an antonym in situations where "foliage" refers to vegetation in general, as rock is a non-living element.
* Sand: This could be considered an antonym in situations where "foliage" refers to plants growing in a specific environment, as sand signifies a barren desert landscape.
Ultimately, the best antonym for "foliage" depends on the specific context and what aspect of foliage you want to contrast.