Longman Dictionary of Contemporary English homepage

unpredictable

 adjective
     
un‧pre‧dict‧a‧ble
1 changing a lot so it is impossible to know what will happen:
unpredictable weather
the unpredictable nature of language
2 someone who is unpredictable tends to change their behaviour or ideas suddenly, so that you never know what they are going to do or think
—unpredictably adverb —unpredictability noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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