What is the opposite of these words?

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