Definition of unpredictably adverb from the Oxford Advanced Learner's Dictionary

 

unpredictably

 adverb
adverb
BrE BrE//ˌʌnprɪˈdɪktəbli//
 
; NAmE NAmE//ˌʌnprɪˈdɪktəbli//
 
 
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in a way that cannot be predicted It is known that wildfires behave unpredictably. opposite predictably (1)