Adjectives of opinion

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Across
  1. 1. The opposite of easy
  2. 4. The opposite of terrible
  3. 6. The opposite of fun
  4. 8. The opposite of dumb
Down
  1. 2. The opposite of Boring
  2. 3. The opposite of difficult
  3. 5. The opposite of Uninteresting
  4. 7. The opposite of safe