Opposite works

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Across
  1. 4. COLD
  2. 8. DARK
  3. 10. UGLY
  4. 12. DIRTY
  5. 13. CLOSED
  6. 15. LATE
  7. 17. OLD
  8. 20. DIFFICULT
Down
  1. 1. WRONG
  2. 2. EMPTY
  3. 3. SMALL
  4. 5. THIN
  5. 6. SHORT
  6. 7. WEAK
  7. 9. SAD
  8. 11. SLOW
  9. 14. FAR
  10. 16. POOR
  11. 18. NEW
  12. 19. QUIET