Un and Tri

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Across
  1. 3. not feeling or showing gratitude
  2. 6. a three legged stool
  3. 7. causing discomfort
  4. 8. a three part series in the movies or a book
Down
  1. 1. not feeling confident
  2. 2. a group of three people working together
  3. 3. out of the ordinary; unusual
  4. 4. a three pronged spear
  5. 5. not likely to happen