What is the opposite

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Across
  1. 2. blunt
  2. 4. comedy
  3. 9. foreground
  4. 10. accidental
  5. 11. heat
  6. 14. accept
  7. 15. ceiling
  8. 17. bad luck
  9. 19. night
Down
  1. 1. bottom
  2. 3. lack
  3. 5. best
  4. 6. presence
  5. 7. beauty
  6. 8. simple
  7. 12. add
  8. 13. above
  9. 16. bad
  10. 18. beautiful
  11. 20. exactly