Opposites Attract

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Across
  1. 3. opposite of "restriction"; first letter F
  2. 5. opposite of "infectious"; first letter N
  3. 6. opposite of "accelerate"; first letter D
  4. 7. opposite of "vulnerable"; first letter I
Down
  1. 1. opposite of "caution"; first letter C
  2. 2. opposite of "mortality"; first letter I
  3. 4. opposite of "urge"; first letter D