Empty doesn't seem to have a gradable antonym. If something is not empty and not full, then it is not empty, but is there a single word expression for this?
Edit:
To make it more evident, I'm looking for something like what warm is on the scale of cold and hot.
Best Answer
Sparse and its antonym dense may serve in some contexts, such as mathematics and computer science. For example, a sparse set is a set that has few members out of a large potential population of members. An empty set has no members, and a dense set has many members. However, I can't recall hearing the term full set in this context.
In other contexts, such as "a glass half-full" one would not use sparse or dense.