Pessimism is the tendency to expect bad outcomes or focus on the worst aspects of a situation. A pessimist looks at dark clouds and immediately cancels outdoor plans, while an optimist sees the same clouds and brings an umbrella just in case. When a pessimistic student gets back a test with one wrong answer, they might think “I'm terrible at this subject” instead of “I got almost everything right.”

Pessimism goes beyond simple caution or preparing for problems. It means habitually expecting things to go wrong, even when there's good reason for hope. A pessimist might assume they won't make the soccer team before tryouts even start, or expect their science project to fail before giving it their best effort. This mindset can become a self-fulfilling prophecy: if someone is convinced they'll fail, they might not try as hard, which makes failure more likely.

The opposite of pessimism is optimism, which means expecting good outcomes and focusing on possibilities rather than problems. Many people try to balance both: they stay hopeful about what they can achieve while staying realistic about challenges they'll need to overcome. Someone who says “this might be difficult, but I can figure it out” isn't being pessimistic or unrealistically optimistic. They're being thoughtfully confident.