Think Hard !

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Across
  1. 3. detached
  2. 4. abandon
  3. 7. resounding
  4. 12. dissatisfied
  5. 15. expand
  6. 17. difficult
  7. 20. attention
Down
  1. 1. ambiance
  2. 2. smuggled
  3. 5. polite
  4. 6. permanent
  5. 8. challenge
  6. 9. translucent
  7. 10. natural tendency
  8. 11. rebounding
  9. 13. filmsy
  10. 14. abusive
  11. 16. guess
  12. 18. irregular
  13. 19. scholarly