Antonyms Puzzle

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Across
  1. 1. Certain
  2. 5. Listener-oriented
  3. 9. Opposition
  4. 10. Divide
  5. 11. Simplifying
  6. 12. Optional
  7. 15. Unconventional
Down
  1. 2. Limits
  2. 3. Neglect
  3. 4. Derived
  4. 6. Dependently
  5. 7. Uniform
  6. 8. Unattested
  7. 13. Excludes
  8. 14. Future