Spelling crossword puzzle

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Across
  1. 4. to change or become more complete over time
  2. 6. opposite to clockwise
  3. 8. liquid added to car engines to stop fuel freezing
  4. 9. to rot or go bad
  5. 11. the antidote to a spider or snake bite
  6. 12. feeling anxious or concerned
  7. 14. ancient or very old
  8. 16. a drug able to kill bacteria
  9. 17. to ruin or destroy something completely
  10. 18. forecasts of whats going to happen
Down
  1. 1. to fail to fulfil someone's hopes
  2. 2. the exact opposite
  3. 3. to put an end to something
  4. 4. to give a picture of something using words
  5. 5. how someone acts
  6. 7. a place with no one there
  7. 10. behaviour that deviates from social norm
  8. 13. without money or the means to get any
  9. 15. a feeling of strong dislike
  10. 17. to rely on someone