Saying the opposites

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Across
  1. 2. innocent
  2. 3. tiny
  3. 6. optimistic
  4. 11. calm
  5. 12. simple
  6. 13. defeat
  7. 15. fake
  8. 17. unkind
Down
  1. 1. stupid
  2. 4. possible
  3. 5. encourage
  4. 7. happiness
  5. 8. poor
  6. 9. plausible
  7. 10. normal
  8. 14. safe
  9. 16. mature