unpredictable
//ˌʌnprɪˈdɪktəbəl//
Adjective
unpredictableCanonical form
more unpredictableComparative
most unpredictableSuperlative
1
Not able to be predicted or foreseen; liable to change suddenly and without apparent reason.
The weather in the mountains is unpredictable.
2
Behaving in a way that is difficult to anticipate or expect.
My boss is unpredictable, so I never know how he will react.