Emotions!

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Across
  1. 5. Wavering or uncertain, as in opinions or behaviour
  2. 6. Bad tempered and easily angered
  3. 9. Disposed to take a favourable view of events or conditions and to expect the most favorable outcome
  4. 10. Causing gloom or dejection
Down
  1. 1. A sudden wave of keen emotion or excitement
  2. 2. To be overcome with surprise and bewilderment
  3. 3. Greatly surprised and suddenly filled with wonder
  4. 4. Intensely happy or confident
  5. 7. Endowed with or characterized by a joyous humour or a spirit of good-fellowship
  6. 8. Extremely tense and nervous; jumpy