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Across
  1. 3. A harsh, discordant mixture of sounds.
  2. 6. Light, delicate, and translucent.
  3. 8. A moment of sudden and profound realization or discovery. (Note: Repeated for variety.)
  4. 10. Lasting for a very short time.
  5. 11. Essentially different in kind; not allowing comparison.
  6. 12. Extremely idealistic, unrealistic, and impractical. (Note: Repeated for variety.)
Down
  1. 1. Mysterious, puzzling, and difficult to understand.
  2. 2. Occurring or encountered on a daily basis; ordinary. (Note: Repeated for variety.)
  3. 4. Brisk and cheerful readiness.
  4. 5. Make (something bad or unsatisfactory) better.
  5. 7. Having keen perception, sound judgment, and wisdom. (Note: Repeated for variety.)
  6. 9. Self-confidence or assurance, especially when in a demanding situation.