1. the state of being empty or lacking content
2. lack of intelligence or substance; mental emptiness

Examples

• The vacuity of the abandoned building was unsettling.
• She stared into the vacuity of space through the telescope.
• His speech was filled with vacuity and offered no real solutions.
• The vacuity of her expression suggested she wasn’t listening.
• Critics noted the vacuity of the film’s plot.
• The philosopher wrote about the vacuity of modern consumer culture.