4A

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Across
  1. 2. Very broad and happy
  2. 3. Undergo
  3. 4. Healthy
  4. 5. Irrespective
  5. 10. Soothing
  6. 11. Incorporate
  7. 12. Influence
  8. 14. One-of-a-kind
  9. 15. Cheeky
  10. 18. Mysterious
  11. 20. Propensity
  12. 22. Healing
  13. 23. Vital
Down
  1. 1. Worsening
  2. 4. Common, prevalent
  3. 6. Profound
  4. 7. A motive
  5. 8. Spreading quickly
  6. 9. Fluffy
  7. 13. Hypothesise
  8. 16. Rude smile
  9. 17. Only, simply
  10. 19. Joyful smile
  11. 21. Weak