他和父亲的关系非常棘手。

He has a very ___problematic relationship with his father.

另一方面，存在一些需要立即关注的有问题的事宜。

On the other hand, there were some ___problematic issues that needed immediate attention.

该地区的经济形势仍然问题重重。

The economic situation in the region remains highly ___problematic.