vacuousness

adjective

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.

adjective

1. containing nothing; empty
2. bereft of ideas or intelligence; mindless
3. characterized by or resulting from vacancy of minda vacuous gaze
4. indulging in no useful mental or physical activity; idle
5. logic maths (of an operator or expression) having no import; idle: in (x) (John is tall) the quantifier (x) is vacuous