What is the opposite?

12345678910111213141516171819202122
Across
  1. 4. light
  2. 5. slow
  3. 7. cheap
  4. 9. sad
  5. 10. ugly
  6. 11. rich
  7. 12. old
  8. 15. quiet
  9. 16. clean
  10. 18. wide
  11. 20. nasty
  12. 21. small
  13. 22. dry
Down
  1. 1. thin
  2. 2. dangerous
  3. 3. difficult
  4. 6. deep
  5. 8. boring
  6. 13. bad
  7. 14. messy
  8. 17. weak
  9. 19. old