Opposites!

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Across
  1. 2. The opposite of pretty.
  2. 5. The opposite of quiet.
  3. 6. The opposite of up.
  4. 7. The opposite of less.
Down
  1. 1. The opposite of boy.
  2. 3. The opposite of bad.
  3. 4. The opposite of fast.
  4. 6. The opposite of light.