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

 

uncharacteristically

 adverb
adverb
BrE BrE//ˌʌnˌkærəktəˈrɪstɪkli//
 
; NAmE NAmE//ˌʌnˌkærəktəˈrɪstɪkli//
 
 
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in a way that is not typical of somebody or the way they usually behave The children had been uncharacteristically quiet. opposite characteristically