opposites!

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Across
  1. 4. the opposite of big
  2. 6. the opposite of loud
  3. 7. the opposite of young
  4. 8. the opposite of fast
  5. 10. the opposite of low
  6. 12. the opposite of light
  7. 13. the opposite of old
Down
  1. 1. the opposite of slow
  2. 2. the opposite of happy
  3. 3. the opposite of dark
  4. 5. the opposite of high
  5. 9. the opposite of quiet
  6. 10. the opposite of sad
  7. 11. the opposite of small