Despair!

Source

To despair is to lose all hope. Despair can also be used as a noun meaning complete hopelessness. Despair usually involves deep sadness and emotional pain about something that has happened or that hasn't happened—something usually triggers the despair. Source

This is one of the human the most important emotions a human being can display. It is usually common for a person to display despair especially when he is feeling cheated or disappointed, and this happens often in our everyday life.

But most of the time we need to be better than our emotions, and not allow our emotions get the better of us.

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