The word unpredictable means something that is difficult to predict or forecast. It refers to an event, situation or outcome that cannot be anticipated with certainty due to its inherent variability and uncertainty. In other words, it's something that can happen in any number of ways, making it hard for people to make accurate predictions about what will occur next. Unpredictable events may arise from chance occurrences, complex systems or human behavior that is difficult to read or understand.