vacuityEnglishOxford New American Dictionaryvacuity /vaˈkyo͞oədē, , væˈkjuədi , vəˈkyo͞oədē, vəˈkjuədi / ▸ noun 1 lack of thought or intelligence; empty-headedness: full of excitement, I listened to my first student sermon – only to be taken aback by its vacuity. 2 empty space; emptiness.