Opposites!

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Across
  1. 3. The opposite of empty
  2. 6. The opposite of right
  3. 8. The opposite of ugly
  4. 12. The opposite of white
  5. 13. The opposite of big
  6. 14. The opposite of clean
  7. 16. The opposite of down
  8. 17. The opposite of short
Down
  1. 1. The opposite of in
  2. 2. The opposite of fast
  3. 4. The opposite of open
  4. 5. The opposite of day
  5. 7. The opposite of light
  6. 9. The opposite of no
  7. 10. The opposite of hot
  8. 11. The opposite of sad
  9. 15. The opposite of left
  10. 18. The opposite of hate