prefix puzzle

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Across
  1. 4. fearless; adventurous
  2. 6. refusing to obey rules or someone in authority
  3. 8. the ability to understand and share the feelings of another
  4. 9. an underground electric railroad
  5. 11. reciprocal action or influence
  6. 12. inform someone of a danger or possible problem
Down
  1. 1. a person pr thing acting or serving in place of another
  2. 2. in opposition to
  3. 3. having no meaning; making no sense
  4. 5. not securely held or in position
  5. 7. the process or a period of changing from one state
  6. 10. intensify, increase, or further improve the quality, value, or extent of