数学老师出的这道题真是个难题，班上没人能解出来。

The math problem the teacher gave was a real ___stumper, nobody in the class could solve it.

那个穿着大靴子的男孩有点不知所措，在走廊里笨重地走着，发出很大的声响。

The boy in big boots was a little ___stumped, clomping noisily down the hallway.