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Across
  1. 1. Attractively lively and animated.
  2. 5. Holding fast; persistent in maintaining or adhering to something valued or habitual.
  3. 10. Friendly, pleasant, and good-natured. (Note: Repeated for variety.)
  4. 11. Feeling or expressing great joy and happiness. (Note: Repeated for variety.)
  5. 12. The occurrence and development of events by chance in a happy or beneficial way.
Down
  1. 2. Perceptive, intelligent, and able to notice and understand things clearly. (Note: Repeated for variety.)
  2. 3. Seeming reasonable or probable.
  3. 4. Sending out light; shining or glowing brightly. (Note: Repeated for variety.)
  4. 6. Tending to be different or develop in different directions.
  5. 7. Calm, peaceful, and untroubled. (Note: Repeated for variety.)
  6. 8. To grow or develop in a healthy or vigorous way. (Note: Repeated for variety.)
  7. 9. Attractively unusual or old-fashioned. (Note: Repeated for variety.)