say it: uhn-pruh-dik-tuh-BIL-i-tee
unpredictability is a noun meaning "the quality of being guided by sudden unpredictable impulses". It carries 3 recorded senses.
the quality of being guided by sudden unpredictable impulses
the trait of being unpredictably irresolute
“the volatility of the market drove many investors away”
lacking predictability
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for unpredictability come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.