Opposites!

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