What are the opposite words for plenum?

The word "plenum" refers to a space that is completely filled with matter or air. Its antonyms are "void" and "vacuum" which describe a place or space that is empty or lacks anything substantial. Other antonyms for "plenum" may include "sparse", "bare", "scanty", "barely filled", and "insufficient". These words describe spaces that are lacking in fullness, density, or substance. On the contrary, "plenum" can also be considered an antonym for "void" and "vacuum", as it represents a space that is full, crowded, and overflowing with matter or air. In short, the antonyms of "plenum" describe the opposite of a space that is full, while "plenum" itself represents fullness and volume.