Last Kids On Earth Puzzle

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Across
  1. 2. -causing fear
  2. 4. massive or imposing
  3. 6. pain
  4. 7. - brutal and crude
  5. 9. - threatening and portending
  6. 11. and noise
  7. 15. -opposite of safety
  8. 17. first and original
  9. 18. - monever stratagem
  10. 19. secret and private
  11. 20. shaped
Down
  1. 1. and perplexing
  2. 3. - likely to occur at any moment
  3. 5. unclear imprecise
  4. 8. a young woman
  5. 10. - savage and crazy
  6. 12. estimate
  7. 13. - cannot be entered
  8. 14. of speech
  9. 16. - gigantic and mean