inexcusably

The delivery was inexcusably late, arriving three days after the promised date.

(Chinese) 这次送货延迟得不可理喻，在承诺日期三天后才送到。

He behaved inexcusably toward the waiter, shouting and making a scene.

(Chinese) 他对服务员的表现极其无礼，大喊大叫并大闹一场。