Opposite of...

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Across
  1. 1. yes
  2. 5. old
  3. 6. walk
  4. 9. big
  5. 10. enemy
  6. 13. boy
  7. 14. slim
  8. 15. short
Down
  1. 2. closed
  2. 3. summer
  3. 4. rich
  4. 6. write
  5. 7. sad
  6. 8. white
  7. 9. buy
  8. 10. slow
  9. 11. out
  10. 12. morning