Dissonance causes feelings of unhappiness, discomfort, or distress. Happiness is not inextricably linked to optimism, nor is pessimism inextricably linked to unhappiness. Displeasure at another's unhappiness is sympathy, pity, or compassion. In 1898, after much unhappiness and disillusionment, Montgomery broke off her engagement to Simpson. "What to Do" connect modern society to feelings of unhappiness. Angry outbursts can be a way of trying to cope with unhappiness or depression. Fear was considered the source of most unhappiness. She ends up spending many sleepless nights in unhappiness and uncertainty. Bertrand Russell said that envy was one of the most potent causes of unhappiness. Some people are entertained by others' pain or the idea of their unhappiness (schadenfreude). Joan's unhappiness worsens as adulation is heaped on Joseph. He realizes his unhappiness with her and breaks up. They fight, but despite her initial unhappiness, Susan eventually gives them her blessing. Hadrian's last few years were marked by conflict and unhappiness. This attitude was in marked contrast to Pink Floyd's unhappiness with Smith.