pre/suffixes

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Across
  1. 2. superlative of strong
  2. 6. with a lot of stress
  3. 11. to appear again
  4. 13. opposite of usual
  5. 14. a noun of the synonym of to improve
  6. 16. easy to carry around
  7. 18. impossible to get through
  8. 19. prefix for something/someone that previously was something/someone
  9. 20. preposterous
Down
  1. 1. opposite of possible. Also a very common line from villains in fiction.
  2. 3. possible to undo
  3. 4. very bad
  4. 5. against the law
  5. 7. a mix of best/biggest
  6. 8. performing an action in a lazy way
  7. 9. to not say a name/a word correctly
  8. 10. separated from/existing without a body
  9. 12. (noun) you can achieve it in a competition
  10. 15. without boundaries, never ending
  11. 17. (noun) opposite of sad