他含糊其辞地解释了这个问题，没人能明白他的意思。

He explained the problem so ___obscurely that no one could understand his point.

这位艺术家默默无闻地在乡下创作了十年。

The artist worked ___obscurely in the countryside for ten years.

作者将自己的名字隐晦地写在书的扉页角落。

The author wrote his name ___obscurely in the corner of the book's title page.