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unpredictable

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adjective unpredictable pronunciation in American English /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 behavior

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

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unpredictably

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protologism

a new word or phrase invented in the hope that it will become generally used

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