Last Kids on Earth Puzzle

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Across
  1. 3. first and original
  2. 5. - cannot be entered
  3. 8. -causing fear
  4. 9. unclear imprecise
  5. 10. - gigantic and mean
  6. 12. massive or imposing
  7. 14. - savage and crazy
  8. 15. - threatening and portending
  9. 16. secret and private
  10. 17. - mo-never stratagem
  11. 18. and noise
  12. 20. pain
Down
  1. 1. and perplexing
  2. 2. a young woman
  3. 4. - likely to occur at any moment
  4. 6. -opposite of safety
  5. 7. of speech
  6. 11. shaped
  7. 13. estimate
  8. 19. - brutal and crude