Synonyms!

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Across
  1. 3. That was a terrible performance.
  2. 4. Glum and depressing e.g. the weather.
  3. 5. Overwhelming levels of happiness!
  4. 6. Triumphantly happy!
  5. 7. Feeling or showing great pleasure.
Down
  1. 1. Sad and alone.
  2. 2. Cheerful and friendly.
  3. 4. Disappointed.
  4. 6. Ecstatically happy!
  5. 8. I'm in low spirits after the loss.