Jonathan Livingston Seagull

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Across
  1. 2. having or showing great effort or energy
  2. 4. Opposite of horizontal
  3. 6. the force that gives something its vitality or strength
  4. 9. free from social conventions or traditional ideas
  5. 11. impossible to stop or prevent
  6. 13. stunts performed in flight by an airplane
  7. 14. flying or rising high in the air
  8. 15. pleasant or attractive
  9. 16. a thing that blocks one's way or prevents or hinders progress
Down
  1. 1. physically strong, fit, and active
  2. 3. difficult to believe
  3. 5. holding or catching the attention
  4. 7. showing or involving great activity or vitality
  5. 8. having a shape which reduces the drag from air moving past
  6. 10. active at night
  7. 12. quick to notice or perceive things