Opposites and synonyms

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Across
  1. 1. the synonym of light
  2. 3. the synonym of quick
  3. 5. the opposite of cheap
  4. 7. the opposite of strong
  5. 9. the opposite of worse
  6. 10. the synonym of new
  7. 12. the opposite of fat
  8. 13. the opposite of easy
  9. 15. the synonym of difficult
  10. 16. the opposite of loud
Down
  1. 2. the opposite of boring
  2. 4. the opposite of old
  3. 6. the opposite of serious
  4. 8. the opposite of slow
  5. 11. the opposite of dark
  6. 14. the opposite of short