incomprehensibly
🇺🇸
/ɪnˌkɑːmprɪˈhensəbli/
🇬🇧
/ɪnˌkɒmprɪˈhensəbli/
so strange or difficult to understand that it is beyond one's ability to grasp
He spoke so quickly that his words were incomprehensibly jumbled.
彼は非常に速く話したので、彼の言葉は理解できないほど混乱していました。