Which term describes a situation where a prediction is uncertain?

The term that best describes a situation where a prediction is uncertain is "uncertain." This word directly conveys the idea that there is a lack of confidence in the outcome of a prediction, meaning that the result could vary or is not definitively known. In contexts involving predictions, uncertainty often arises from incomplete information, variability in the situations being analyzed, or external factors that can influence outcomes.

While terms like "ambiguous" can also imply a lack of clarity, they do not specifically address the variability or unpredictability inherent in a prediction. "Predictable," on the other hand, suggests a degree of certainty about the outcome, which contradicts the essence of uncertainty. Similarly, the term "certain" clearly implies confidence and assurance about an outcome, which is opposite to the idea of an uncertain prediction. Hence, "uncertain" is the most appropriate choice as it precisely captures the essence of unpredictability in forecasting outcomes.