fill the crossword using antonyms

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Across
  1. 2. cellar
  2. 3. elementary
  3. 5. professional
  4. 7. foreground
  5. 9. awful
  6. 12. probably
  7. 13. simple
  8. 14. modern
  9. 15. afraid
Down
  1. 1. lazy
  2. 4. lack
  3. 6. voluntary
  4. 8. negative
  5. 10. presence
  6. 11. intentional