動詞 nonplus:

1. be a mystery or bewildering to
   同義詞：perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, nonplus, gravel, amaze, dumbfound

形容詞 nonplussed:

1. filled with bewilderment
   同義詞：at a loss, nonplused, puzzled

1. The professor is never at a nonplus, and never perplexed by a problem.
   那位教授從來不會感到困惑，也不會被任何問題所難倒。
2. I was completely nonplussed by his sudden appearance.
   他突然出現(xiàn)使我大吃一驚。