HSK 7-9
纳闷儿
nàmènr动
puzzled; bewildered; erhua variant of 纳闷
我正纳闷儿他怎么没来。
Wǒ zhèng nàmènr tā zěnme méi lái.
I'm wondering why he hasn't come.
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Appears across levels (7-9) in the HSK 3.0 word list.