The preffixes

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Across
  1. 5. Something with eight sides
  2. 8. Not organized
  3. 9. Cycle with one wheel
  4. 11. Impossible to resist
  5. 13. Not legible
  6. 15. Something with ten sides
Down
  1. 1. Not possible
  2. 2. Spell a word incorrectly
  3. 3. A set of four
  4. 4. 100 years
  5. 6. Cycle with three wheels
  6. 7. Not like
  7. 10. Something with five sides
  8. 12. Not perfect
  9. 14. Cycle with two wheels