perplex
/pəˈpleks; pɚ`plɛks/ v[Tn]
make (sb) feel puzzled or confused; bewilder 使（某人）困惑、 糊涂或迷惑
The question perplexed me. 那问题把我难住了.
We were perplexed by his failure to answer the letter. 他何以不覆信, 我们大惑不解.
The whole affair is very perplexing. 整件事令人感到莫名其妙.