The Hum of insects

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Across
  1. 3. cannot go wrong
  2. 5. differentiate
  3. 6. unrestrained by scruples
  4. 12. thinking of past
  5. 14. falling to pieces
  6. 15. tiring
Down
  1. 1. retaliation
  2. 2. feeling of delight
  3. 4. combination of sounds that suggest what the word refers to
  4. 7. widely and unfavorably known
  5. 8. meaning less mixture of sounds
  6. 9. wonder
  7. 10. impressive sight
  8. 11. pleasant to the ear
  9. 13. Occurring in profusion