What is the opposite

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