Prefixes: in-, im-, il- and ir-

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Across
  1. 5. apt or liable to vary or change; changeable:
  2. 8. not polite or courteous; discourteous; rude
  3. 10. a distinguishing feature or quality
  4. 12. unable to read and write:
  5. 13. interested or affected
  6. 14. an institution of learning of the highest level
  7. 16. impossible or hard to read or decipher because of poor handwriting, faded print
  8. 18. not accepting delay, opposition, pain, etc., with calm or patience
  9. 19. a seeking or request for truth, information, or knowledge
Down
  1. 1. a sandwich consisting of a cooked patty of ground or chopped beef, usually in a roll or bun, variously garnished.
  2. 2. a member of a congress, especially of the U.S. House of Representatives
  3. 3. unable to be done, performed, effected
  4. 4. a flat paper container, as for a letter or thin package,
  5. 6. not full or finished.
  6. 7. said, done, or characterized by a lack of a sense of responsibility
  7. 9. that which tends to prove or disprove something
  8. 11. to arrange or organize by classes
  9. 12. without symmetry, even shape, formal arrangement
  10. 15. of, relating to, or characterized by defects or weaknesses:
  11. 17. contrary to or disregardful of the rules of logic; unreasoning