这部冗长的纪录片看得人麻木不仁，几乎感受不到任何情感波动。

The documentary was so long and ___numbingly dull that I could hardly feel any emotional response.

会议冗长而无聊地进行着，让人昏昏欲睡。

The meeting went on ___numbingly for ages, making everyone drowsy.