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Across
  1. 4. moving from place to place, traveling continuously.
  2. 5. to confuse, bewilder, or make something unclear.
  3. 7. too great or extreme to be expressed or described in words.
  4. 9. characterized by long words; using long words.
  5. 10. A confusing and difficult problem or question [1]
  6. 11. having a keen perception, understanding, or insight.
  7. 12. unclear, vague, or ill-defined.
Down
  1. 1. enigmatic or puzzling, especially in a crossword context.
  2. 2. a solution or remedy for all difficulties or diseases.
  3. 3. exceedingly idealistic, unrealistic, and impractical.
  4. 6. Confusing or bewildering [2]
  5. 8. lasting for a very short time.