Prefixes, suffixes

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Across
  1. 3. unlike
  2. 4. reopen
  3. 7. impolite
  4. 8. distrust
  5. 10. irregular
  6. 11. refresh
  7. 13. careless
  8. 14. motionless
  9. 17. weakness
  10. 18. insecure
  11. 19. fearless
  12. 20. unable
Down
  1. 1. hopeless
  2. 2. happiness
  3. 3. disagree
  4. 5. unconfortable
  5. 6. impossible
  6. 7. inhabit
  7. 9. irresponsible
  8. 12. unpleasant
  9. 15. disability
  10. 16. useless
  11. 18. unknown