What is the opposite?

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Across
  1. 3. light
  2. 4. messy
  3. 6. weak
  4. 10. thin
  5. 11. cheap
  6. 15. clean
  7. 16. deep
  8. 18. bad
  9. 19. dry
  10. 21. sad
Down
  1. 1. slow
  2. 2. rich
  3. 5. boring
  4. 6. dangerous
  5. 7. old
  6. 8. ugly
  7. 9. small
  8. 12. nasty
  9. 13. wide
  10. 14. old
  11. 17. quiet
  12. 20. difficult