Is chocolate the answer?

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Across
  1. 2. Not thought about or remembered by people any more
  2. 5. To make something smaller or less in size, amount, importance etc
  3. 6. Not able to be touched or measured, and difficult to describe or explain
  4. 7. To be very happy about something
  5. 9. The state of being successful, usually by making money
  6. 10. Completely necessary
Down
  1. 1. Left alone, empty or no longer used
  2. 3. To feel rather sad :'(
  3. 4. Kindness, especially in giving things to people
  4. 8. The characteristic of someone not willing to work or do any activity that needs effort