他一声不吭就走了，真叫人莫名其妙。

It is quite baffling that he left without a word.

《新英汉大辞典》

对于一些在我看来，今天莫名其妙的原因，我说了声“让我看看。”

For some inexplicable to me even today reason, all I said was "Show me".

youdao

对于一些在我看来，今天莫名其妙的原因，我说了声“让我看看。”

For some inexplicable to me even today reason, all I said was "Show me".

youdao