Opposites (use prefixes: mis-, dis-, un-, in-, im-, ir-, il-)

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Across
  1. 4. reliable
  2. 6. install
  3. 7. healthy
  4. 8. understand
  5. 9. mature
  6. 10. regular
  7. 11. possible
  8. 15. relevant
  9. 17. agreement
  10. 18. believe
Down
  1. 1. treat
  2. 2. responsible
  3. 3. appropriate
  4. 5. healthy
  5. 7. related
  6. 12. legal
  7. 13. behave
  8. 14. lawful
  9. 16. friendly