“Unpredictability” refers to the quality of being impossible to foresee or anticipate. Some synonyms for “unpredictability” are “capriciousness”, “inconstancy”, “unforeseeability”, and “erraticism”.
“Capriciousness” implies sudden and unexpected changes in behavior or mood. For example, “The weather in this region is known for its capriciousness.” This shows that it is difficult to predict how the weather will be from one day to the next.
“Inconstancy” suggests a lack of stability or consistency. “His moods are marked by inconstancy.” Here, it means that his moods are unpredictable and can change quickly.
“Unforeseeability” emphasizes the inability to anticipate or foresee something. “The outcome of the experiment was full of unforeseeability.” This indicates that the results were not what was expected and could not have been predicted.
“Erraticism” refers to irregular or unpredictable behavior. “The stock market is known for its erraticism.” This shows that the movements of the stock market are difficult to predict and can be very unpredictable.