Antonyms are opposites

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Across
  1. 2. usual
  2. 3. sense
  3. 5. legal
  4. 6. complete
  5. 7. approve
  6. 8. known
  7. 10. direct
  8. 13. mature
  9. 15. honest
  10. 16. happy
  11. 17. able
Down
  1. 1. advantage
  2. 4. logical
  3. 5. responsible
  4. 9. possible
  5. 11. native
  6. 12. regular
  7. 14. like