Saying the opposites

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