Stupid...

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Across
  1. 4. Opposite of high (5)
  2. 5. Hot season (5)
  3. 7. Not appropriate (13)
  4. 9. Not straight (5)
  5. 11. Liked by many people (4,5)
  6. 12. Covered with water (10)
  7. 13. Symbolic objects (7)
  8. 15. Relating to sight (4)
  9. 16. Museum Keeper (8)
  10. 17. Experienced Driver (6)
Down
  1. 1. Strong Spirit (5)
  2. 2. Place of Warship (6)
  3. 3. Soft type of rock (10)
  4. 5. Runner (6)
  5. 6. Ancient Norsemen (7)
  6. 8. Tuneful (5)
  7. 10. Under the Ground (11)
  8. 14. Act of sending a message (9)
  9. 18. Strayed from the right course (4)