Definition of unpredictable adjective from the Oxford Advanced Learner's Dictionary

      

    unpredictable

     adjective
    adjective
    BrE BrE//ˌʌnprɪˈdɪktəbl//
     
    ; NAmE NAmE//ˌʌnprɪˈdɪktəbl//
     
     
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  1. 1that cannot be predicted because it changes a lot or depends on too many different things unpredictable weather The result is entirely unpredictable.
  2. 2if a person is unpredictable, you cannot predict how they will behave in a particular situation opposite predictable
  3. Extra examples Her behaviour became so unpredictable when she had been drinking. No-one knows where they stand with him; he is utterly unpredictable. Role play trains students to deal with the unpredictable nature of language. The unpredictable weather in the mountains can make climbing extremely hazardous.
See the Oxford Advanced American Dictionary entry: unpredictable