nonplussed

他提出的奇怪问题让我完全不知所措。

His bizarre question completely ___nonplussed me.

当厨师从新来的服务员手中接过一盘生食材时，他完全不知所措。

The chef was ___nonplussed when he received a plate of raw ingredients from the new waiter.

当导航带着她绕了一圈又回到同一个喷泉时，那位游客一脸茫然。

The tourist looked ___nonplussed when the GPS sent her in a circle back to the same fountain.