If you are asked a question or can not figure something out then it is said that you are "stumped" meaning you can go no further.
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Only one, because it is pronounced "stumpt".
perplexing beffudling confounding confusing mystifying puzzling
The magician, an expert at legerdemain, performed an intricate card trick that stumped the crowd.
We can't tell the difference between the "base" and the "width" of a triangle, so we're frankly stumped.