TRANQUILTY

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Across
  1. 2. a feeling of calmness; a quiet and undisturbed feeling
  2. 5. steadiness of mind under stress
  3. 6. make (someone) be quiet or stop talking
  4. 8. coolness: calm and unruffled self-assurance
  5. 10. a trait of dignified seriousness
  6. 11. a state of rest, sleep, or tranquillity
  7. 12. the state of being calm, peaceful, and untroubled
  8. 14. calmness and composure, especially in a difficult situation
  9. 16. the state or feeling of being calm and in control of oneself
  10. 18. cease work or movement in order to relax, sleep, or recover strength
Down
  1. 1. calm and unruffled self-assurance
  2. 3. the quality or state of being tranquil
  3. 4. the property of making no sound
  4. 7. a state that is calm and tranquil
  5. 8. Not perturbed; unflustered
  6. 9. the attribute of being restful
  7. 12. tranquil silence; "the still of the night
  8. 13. a state of stillness, calmness
  9. 15. a state of serene calmness
  10. 17. an authoritative command or instruction