The word "over swarms" refers to an excess or abundance of something. Its antonyms, on the other hand, imply a scarcity or shortage. A few such antonyms include "scarce," "depleted," "sparse," and "deficient." Whereas over swarms suggest an overabundance of insects, animals, or people, scarce refers to a lack of resources or a shortage of goods. Likewise, depleted signifies the depletion of a resource, while a sparse population refers to a place with few inhabitants. Finally, deficient means lacking in quality, and it can be used to describe a person's abilities or a product's features. Thus, these antonyms can help to convey an entirely different meaning from over swarms.