Mudslide

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Across
  1. 4. succeed in forcing a way into or through
  2. 6. in an unceasingly intense or harsh way
Down
  1. 1. firmness of purpose; resoluteness
  2. 2. Having the ability, fitness, or quality necessary to do or achieve a specified thing
  3. 3. Constructive, optimistic, or confident
  4. 5. In a way that shows despair