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Adjective: vacuous  va-kyoo-us
  1. Showing a lack of intelligence or thought; stupid and silly
    "It was in this last category that the vacuous comments began";
    - asinine, fatuous, inane, mindless
  2. Without value, significance or point
    "vacuous comments";
    - empty, hollow
  3. Devoid of matter
    "a vacuous space"
  4. Void of expression
    "a vacuous stare";
    - blank

See also: daft, dumb, empty, foolish, incommunicative, meaningless, nonmeaningful, stupid, uncommunicative

Encyclopedia: Vacuous