What is the opposite of......?

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Across
  1. 2. old
  2. 4. hard
  3. 7. wrong
  4. 10. deep
  5. 12. beautiful
  6. 13. heavy
  7. 15. short
Down
  1. 1. messy
  2. 3. strong
  3. 5. witty
  4. 6. dry
  5. 8. big
  6. 9. hot
  7. 11. black
  8. 14. fat