Prefix puzzle

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Across
  1. 1. transportation underground
  2. 3. see or view before
  3. 5. a book that is not fictional
  4. 8. count wrongly
  5. 9. submit again
  6. 10. calculate wrongly
  7. 12. write again
  8. 13. understand wrongly
  9. 16. do again
  10. 17. not poisonous
  11. 19. throw or out something in
Down
  1. 1. to under write a magazine
  2. 2. say or think before
  3. 4. not having fat
  4. 6. not subject to death
  5. 7. vehicle underwater
  6. 11. not valid inscribe write on
  7. 14. something that is very big or extremely large
  8. 15. heat before
  9. 18. relating to the condition of you immunity