uncharacteristic - definition and synonyms

adjective 

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/ʌnˌkærɪktəˈrɪstɪk/
  1. not typical of someone’s usual behaviour or performance, and therefore surprising

    The champion’s play was full of uncharacteristic mistakes.

derived word

uncharacteristically

 

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/ʌnˌkærɪktəˈrɪstɪkli/
adverb