Prefix 'il-' or 'ir-'

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Across
  1. 2. Something that does not form a regular pattern (9)
  2. 4. A person who cannot read or write (10)
  3. 5. Something of little or no importance (10)
  4. 6. Hard to resist (12)
  5. 7. Something that doesn't make sense (9)
  6. 9. Forbidden by law, criminal (7)
Down
  1. 1. Not having or showing responsibility (13)
  2. 2. Acting before thinking, or acting without reason (10)
  3. 3. Not clear enough to read (9)
  4. 8. Synonym of 4 down (7)