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

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