Definition of uncharacteristic adjective from the Oxford Advanced American Dictionary

 

uncharacteristic

 adjective
adjective
NAmE//ˌʌnkærəktəˈrɪstɪk//
 
uncharacteristic (of somebody)
 
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not typical of someone; not the way someone usually behaves The remark was totally uncharacteristic of her. opposite characteristic
uncharacteristically
 
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NAmE//ˌʌnkærəktəˈrɪstɪkli//
 
adverb The children had been uncharacteristically quiet.
See the Oxford Advanced Learner's Dictionary entry: uncharacteristic