unpredictable - definition and synonyms

 
adjective 

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/ˌʌnprɪˈdɪktəb(ə)l/
  1. changing often, in a way that is impossible to prepare for

    The weather here is really unpredictable.

    1. a.
      used about a person or their behaviour

      The men in this prison are unpredictable, violent, and dangerous.

derived word

unpredictably

adverb