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Pessimism is a negative mental attitude in which an undesirable outcome is anticipated from a given situation. Pessimists tend to focus on the negatives of life in general. A common question asked to test for pessimism is "Is the glass half empty or half full?"; in this situation, a pessimist is said to see the glass as half empty, while an optimist is said to see the glass as half full. Throughout history, the pessimistic disposition has had effects on all major areas of thinking.

Philosophical pessimism is the related idea that views the world in a strictly anti-optimistic fashion. This form of pessimism is not an emotional disposition as the term commonly connotes. Instead, it is a philosophy or worldview that directly challenges the notion of progress and what may be considered the faith-based claims of optimism. Philosophical pessimists are often existential nihilists believing that life has no intrinsic meaning or value. Their responses to this condition, however, are widely varied and often life-affirming.

Etymology