Pronunciation: (vak'yOO-us), [key]
1. without contents; empty: the vacuous air.
2. lacking in ideas or intelligence: a vacuous mind.
3. expressing or characterized by a lack of ideas or intelligence; inane; stupid: a vacuous book.
4. purposeless; idle: a vacuous way of life.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.