及物动词

1. 使困惑；使担心；迷惑
If something perplexes you, it confuses and worries you because you do not understand it or because it causes you difficulty.

1. make more complicated

e.g. There was a new development that complicated the matter

Synonym: complicate

2. be a mystery or bewildering to

e.g. This beats me!
Got me--I don't know the answer!
a vexing problem
This question really stuck me

Synonym: vexstickgetpuzzlemystifybafflebeatposebewilderflummoxstupefynonplusgravelamazedumbfound