Forming Opposites Using Suffixes

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Across
  1. 2. I don't agree.I ...
  2. 5. is it posible to fly?
  3. 6. don't come it is not safe
  4. 7. stealing is something....
  5. 8. suitable and appropriate
Down
  1. 1. he can't take responsibility
  2. 3. not logical
  3. 4. something pure