Pronunciation: (va-kyOO'i-tē, vu-),[key] —n., —pl.-ties. 1. the state of being vacuous or without contents; vacancy; emptiness: the vacuity of the open sea. 2. absence of thought or intelligence; inanity; blankness: a mind of undeniable vacuity. 3. a time or state of dullness, lacking in mental or physical action or productivity: the vacuity of modern existence. 4. an empty space; void: a vacuity in the earth formed by erosion. 5. absence or lack of something specified: a vacuity of feeling. 6. something inane, senseless, or stupid: conversation full of vacuities. 7. a vacuum.