The phrase "lapped over" implies that something is extending beyond its intended boundary. Therefore, antonyms for this term might include "contained," "separated," or "restricted." To describe a situation where something is neatly within its designated space, one might use words like "confined," "boxed in," or "contained." Conversely, if one wishes to intentionally keep something separated from another, words such as "isolated," "detached," or "partitioned" could be used. Finally, to emphasize the idea of a boundary or limit, one might use terms such as "delimited," "circumscribed," or "bound.