What is the opposite of these words?

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Across
  1. 2. up
  2. 3. over
  3. 5. small
  4. 6. fast
  5. 8. full
  6. 12. tall
  7. 14. weak
  8. 16. sad
  9. 17. light
Down
  1. 1. bad
  2. 4. day
  3. 7. dry
  4. 9. rich
  5. 10. difficult
  6. 11. near
  7. 13. low
  8. 15. young
  9. 16. cold