inexcusable
adjective uk/ˌɪn.ɪkˈskjuː.zə.bəl/ us/ˌɪn.ɪkˈskjuː.zə.bəl/
（行为）不可原谅的，不可宽恕的
(of behaviour) too bad to be accepted
His drunken outbursts during the mayor's speech were inexcusable. 市长讲话时他耍酒疯是不可原谅的。
It's inexcusable that such young children were left in the house alone. 把这么小的孩子单独留在家里是不可原谅的。