纳闷儿 nàmènr to be puzzled; to feel perplexed (spoken, erhua)
How to remember 纳闷儿: 纳 to adopt + 闷 gloomy + 儿 son = to be puzzled; to feel perplexed (spoken, erhua).
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How it is used
- Colloquial 'to be puzzled/mystified' by something odd - 我正纳闷儿他为什么没来 (wǒ zhèng nàmènr tā wèishénme méi lái) I was just wondering why he didn't show up.
- Register is casual and spoken (note the 儿 erhua); it's inward puzzlement, not asking a question aloud like 疑问 (yíwèn).
- Often 心里纳闷儿 (xīnli nàmènr) puzzled inside.