Words with silent letters

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Across
  1. 1. Not sure about something
  2. 4. A baby sheep
  3. 7. A tall stone pillar
  4. 8. Serious or formal
  5. 9. A twist or tie in rope
Down
  1. 1. Money you owe
  2. 2. The short, thick finger
  3. 3. The joint on your fingers
  4. 5. The season with falling leaves
  5. 6. A warrior who wore armour in the past