| Noun | 1. | unpredictability - the quality of being guided by sudden unpredictable impulses Synonyms: capriciousness |
| 2. | unpredictability - the trait of being unpredictably irresolute; "the volatility of the market drove many investors away" Synonyms: volatility | |
| 3. | unpredictability - lacking predictability Antonyms: predictability - the quality of being predictable |