CROSSWORD BATTLE

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Across
  1. 3. noun form of 'tenacious'
  2. 4. adverb form of 'facetious'
  3. 5. in low spirits from lack of hope
  4. 7. antonym of fallacy
Down
  1. 1. antonym for 'tenacious'
  2. 2. adjective form of fallacy
  3. 4. wrong belief
  4. 6. having great knowledge or insight