Silent letters

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Across
  1. 3. Land surrounded by water
  2. 4. You do this before entering a room
  3. 7. Serious and respectful tone
  4. 8. A feeling of uncertainty
  5. 9. A Scottish plant with prickly leaves
  6. 10. Feeling no sensation
Down
  1. 1. A place with towers and moats
  2. 2. A spooky figure
  3. 4. A brave warrior in armour
  4. 5. A small leftover piece of food
  5. 6. A quiet body of water in Scotland
  6. 9. A baby sheep