Across
- 3. a lot of, great
- 6. underground
- 9. grim, strict
- 10. achievement, accomplishment
- 14. very old
- 16. make sure
- 17. unlimited, continues
- 19. guard
- 21. basic
Down
- 1. believable, likely
- 2. view
- 4. inadequate, not sufficient
- 5. test
- 7. settled
- 8. primitive, prehistoric
- 11. emphasised
- 12. not hygienic
- 13. muted, made faint
- 15. butterflies in his stomach, nervous
- 18. bright
- 20. stamina, tolerance