他的批评完全无益，对解决问题毫无帮助。

His criticism was completely ___unhelpful and did nothing to solve the problem.

支持团队的回应无益，所以我不得不另寻他法。

The support team's response was ___unhelpful, so I had to find another way.

这种模糊的建议在复杂情况下往往无益。

Such vague advice is often ___unhelpful in complex situations.