Dave's Warm-up

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Across
  1. 2. A close relationship between two organisms where both benefit. (10 letters)
  2. 3. A clever and skillful way of solving a problem. (8 letters)
  3. 6. An imagined place or state where everything is perfect. (6 letters)
  4. 7. A clever or cutting remark, often meant as a joke. (7 letters)
  5. 8. A word meaning 'very light and delicate in a way that seems not of this world.' (9 letters)
  6. 10. Something or someone that cannot be defeated or harmed. (12 letters)
Down
  1. 1. A strong feeling of loyalty or enthusiasm for a person, idea, or activity. (9 letters)
  2. 4. Someone who does not follow established customs or ideas. (11 letters)
  3. 5. A great disaster or a sudden turn of bad luck. (9 letters)
  4. 9. A person who chooses to live alone, away from society. (6 letters)