I love sloths

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Across
  1. 5. to become accustomed to something
  2. 8. to be very clever about something
  3. 10. to be over the phone
  4. 11. things shaped in circles
  5. 12. to be on the edge of something
  6. 13. being able to change to your environment
  7. 15. to be set on doing something
  8. 16. to be very careful or precis
  9. 17. a state that can not change after creation
Down
  1. 1. something added on
  2. 2. to believe that nothing matters
  3. 3. to study and understand langue
  4. 4. to be able to change or conform
  5. 6. to ability of the brain to change over time
  6. 7. belief things should be base on facts and logic
  7. 9. brains are developed by experience
  8. 14. to be weak or slight