Negative prefixes for words beginning with 'm', 'p', 'l' or 'r'

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Across
  1. 2. can be done or might happen
  2. 4. sensible and behaving as expected for their age
  3. 5. so scruffy and tidy it can't be read
  4. 8. meeting expectations or conforming to patterns
  5. 10. can't die or be killed
  6. 11. impeccable and with no mistakes or faults
  7. 12. can't be done or won't happen
  8. 15. connected or linked and appropriate
  9. 16. doesn't mind waiting and is tolerant of delays and problems
  10. 18. not behaving as expected for their age
  11. 19. allowed by the law
Down
  1. 1. silly or untrustworthy or unreliable
  2. 3. sensible or trustworthy or reliable
  3. 6. not meeting expectations or patterns or maybe all the same
  4. 7. unconnected or linked or inappropriate
  5. 9. not perfect
  6. 13. minds waiting and is intolerant of delays or problems
  7. 14. can die or be killed
  8. 17. can (easily) be read
  9. 18. not allowed by the law