He, a man of some acuteness, was dumfoundered.

他，一个有些敏锐的人， 被吓傻了。

I still stood absolutely dumfoundered at what appeared to me her miraculous self-possession and most inscrutable hypocrisy, when the cook entered.

当厨师进来时，我仍然完全目瞪口呆地看着她奇迹般的镇定和最难以理解的虚伪。