Unpredictable
/ˌʌnprɪˈdɪktəbəl/
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Definition
(adj) Unable to be predicted.
Sentence Examples
The accident was caused chiefly by the unpredictable weather.
Both of them are unpredictable and impatient.
CEFR Practice Quiz
The weather in the mountains can be very ____, so you should always carry some warm and waterproof clothes today.