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English definition of “unpredictable”

unpredictable

adjective     /ˌʌn.prɪˈdɪk.tə.bl̩/
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.Changing frequentlyChanging unpredictability     /ˌʌn.prɪ.dɪk.təˈbɪl.ɪ.ti/ US  /-ə.t̬i/ noun [U] Changing frequentlyChanging unpredictably     /-bli/ adverb Not expected or planned
(Definition of unpredictable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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