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English definition of “unpredictable”

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unpredictable

adjective uk   /ˌʌn.prɪˈdɪk.tə.bl̩/ us  
B2 likely to change suddenly and without reason and therefore not able to be predicted (= expected before it happens) or depended on: The weather there can be a bit unpredictable - one minute it's blue skies and the next minute it's pouring down. The hours in this job are very unpredictable - you sometimes have to work late at very short notice.
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unpredictability
noun [U] uk   /ˌʌn.prɪ.dɪk.təˈbɪl.ɪ.ti/ us    /-ə.t̬i/
unpredictably
adverb uk   /-bli/ us  
(Definition of unpredictable from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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