Lost Lesson

123456789101112131415161718
Across
  1. 3. dark, dim (5)
  2. 8. work hard (4)
  3. 10. a person who unlawfully occupies an uninhabited land (8)
  4. 11. border (9)
  5. 12. the state of being empty and alone (10)
  6. 16. the state of being sacred or holy (8)
  7. 17. lack of concern (6)
  8. 18. prehistoric, ancient (8)
Down
  1. 1. unsteady, shaky (6)
  2. 2. cruel (7)
  3. 4. sound of food cooking in hot oil (8)
  4. 5. thrown away (9)
  5. 6. a town that is full of small, roughly built huts (6)
  6. 7. a small squalid or simply constructed dwelling (5)
  7. 9. faded, colourless (4)
  8. 13. dishonour (6)
  9. 14. a temporary home (7)
  10. 15. having an untidy appearance (7)