Batman

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Across
  1. 2. able to move quietly and unseen
  2. 3. able to withstand difficulties
  3. 4. Always alert
  4. 7. displaying bravery
  5. 8. enigmatic and secretive
Down
  1. 1. highly clever
  2. 2. showing little emotion
  3. 4. seeking retribution
  4. 5. lacking fear
  5. 6. deeply thoughtful