- vacuum, vacuity - the absence of matter
--1 is a kind of emptiness
- vacuity, vacuousness - total absence of matter
--2 is a kind of emptiness
- vacuum, vacuity - a region empty of matter
--3 is a kind of region, part
- inanity, senselessness, mindlessness, vacuity, pointlessness - total lack of meaning or ideas
--4 is a kind of meaninglessness