un ‧ char ‧ ac ‧ ter ‧ is ‧ tic /ʌnˌkærətəˈrɪstɪk◂, ʌnˌkærɪtəˈrɪstɪk◂/ BrE AmE adjective
[ Word Family: noun : ↑ character , ↑ characteristic , ↑ characterization ; adjective : ↑ characteristic ≠ ↑ uncharacteristic , ↑ characterless ; verb : ↑ characterize ; adverb : ↑ characteristically ≠ ↑ uncharacteristically ]
not typical of someone or something and therefore surprising
uncharacteristic of
It’s uncharacteristic of her to be late.
—uncharacteristically /-kli/ adverb :
He was uncharacteristically quiet.