The prefixes il-, im-, in-, ir-, and un-

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Across
  1. 4. To reveal or disclose something previously hidden or secret.
  2. 5. Too extreme or unlikely to be considered possible.
  3. 7. Not allowed by law.
  4. 9. Not conforming to a pattern or rule.
  5. 10. Not engaging in physical or mental activity.
  6. 11. Not finished or whole.
  7. 12. To make or become one; to bring together into a single whole.
  8. 13. Lack of proportion or symmetry.
Down
  1. 1. Not based on reason or logic.
  2. 2. Not firm or steady; liable to change or collapse.
  3. 3. Not based on rationality or reason.
  4. 6. Not relevant or significant.
  5. 7. Not able to move or be moved easily.
  6. 8. To undo or separate the threads or fibers of; to clarify or solve.
  7. 10. Not precise or correct.