Word formation

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Across
  1. 5. difficult to reach
  2. 7. always the same
  3. 9. not very important
  4. 11. difficult to identify
  5. 13. how high something is
  6. 15. not yet found
  7. 16. to make someone more powerful
  8. 21. too expensive
  9. 22. to make something longer
  10. 23. difficult to understand
Down
  1. 1. not very responsible
  2. 2. impossible to imagine
  3. 3. something that is left
  4. 4. animals going dead
  5. 6. changing and unpredictable
  6. 8. how wide something is
  7. 10. a hunting event
  8. 12. to make someone sad
  9. 14. lack or too small an amount of something
  10. 15. nothing special
  11. 17. complete, full
  12. 18. making you aware of something new
  13. 19. so loud you can't hear anything else
  14. 20. not likely to become excited