Stupid

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Across
  1. 2. Lacking seriousness or common sense; foolish.
  2. 5. Lacking wisdom or good judgment.
  3. 6. Slow-witted or foolish; often associated with being confused.
  4. 7. Lacking intelligence or sense.
  5. 9. Showing a lack of intelligence; foolish.
Down
  1. 1. Lacking the ability to understand or learn.
  2. 3. So absurd or foolish as to be laughable.
  3. 4. Lacking sense or meaning; silly or foolish.
  4. 6. Lacking the ability to speak or think clearly.
  5. 8. A person of extremely low intelligence or mental capacity.