stupefy

1. V-T If something stupefies you, it shocks or surprises you so much that you cannot think properly for a while. 使震驚; 使驚呆[正式]

...a violent slap on the side of the head, which stunned and stupefied him. ...他的一邊腦袋上猛地挨了一巴掌，使他頓時覺得頭暈目眩。