Sort 50 extension

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Across
  1. 3. - Not acidic or having no acidity
  2. 4. - Unable to be seen or not visible
  3. 8. - Ancestors or predecessors
  4. 9. - Not human or characteristic of non-humans
  5. 11. - Enter a place or domain aggressively
  6. 12. - Make a dent or cut into a surface
  7. 14. - Lacking human qualities or compassion
  8. 15. - Fill with air or expand
  9. 17. - Not straightforward or not directly connected
  10. 18. - Introduction to a book or document
  11. 19. - Decorated with a contrasting material set into the surface
  12. 20. - Located away from the coast or towards the interior
Down
  1. 1. - Not secure or lacking confidence
  2. 2. - Leading or most important position
  3. 5. - Not poisonous or harmful
  4. 6. - Occupy or live in a place
  5. 7. - Ability to predict or anticipate future events
  6. 10. - Warn in advance or caution about future events
  7. 11. - Person confined in an institution or prison
  8. 12. - Growing into the surrounding tissue
  9. 13. - Not alive or lacking life
  10. 16. - Preview or early experience of something