Unusually means happening in a way that's different from what normally occurs or what you'd typically expect. When something happens unusually quickly, it's faster than normal. When the weather is unusually warm for December, temperatures are higher than you'd expect for that time of year.

The word helps us notice when things break the regular pattern. If your normally quiet friend is unusually talkative one day, you might wonder what's got them so excited. If a test was unusually difficult, it means it was harder than your teacher's tests usually are.

Unusually often appears before adjectives to emphasize how far something strays from normal: unusually tall, unusually quiet, unusually crowded. A basketball player might be unusually skilled for their age, meaning they're better than most players that young. The word points out exceptions and surprises, the moments when reality doesn't match what experience has taught us to expect.